Jump to content


 


Register a free account to unlock additional features at BleepingComputer.com
Welcome to BleepingComputer, a free community where people like yourself come together to discuss and learn how to use their computers. Using the site is easy and fun. As a guest, you can browse and view the various discussions in the forums, but can not create a new topic or reply to an existing one unless you are logged in. Other benefits of registering an account are subscribing to topics and forums, creating a blog, and having no ads shown anywhere on the site.


Click here to Register a free account now! or read our Welcome Guide to learn how to use this site.

Photo

Windows 7 hangs when loading driver "CLASSPNP.sys"


  • Please log in to reply
11 replies to this topic

#1 cbblake1

cbblake1

  • Members
  • 34 posts
  • OFFLINE
  •  
  • Local time:05:54 AM

Posted 14 June 2014 - 08:23 AM

Greetings everyone!

 

Not sure what the heck happened... my wife had login errors to her email account, so she rebooted. Computer got to the windows splash screen, and then the monitors went dark, but the computer was still active (hard disk light was on). I tried system repair, no avail. Booted to safe mode, and drivers loaded until reaching "CLASSPNP.sys" and then hung. Any ideas?

 

Thanks

 

CB



BC AdBot (Login to Remove)

 


#2 scotty_ncc1701

scotty_ncc1701

  • Members
  • 520 posts
  • OFFLINE
  •  
  • Gender:Male
  • Local time:06:54 AM

Posted 14 June 2014 - 09:22 AM

http://fixwindowserror.com/repair-classpnp-sys-boot-error-start-pc-easily/ (just found this on a search -- don't know if it is reputable, use at your own risk)

http://support.microsoft.com/kb/326122

https://duckduckgo.com/?q=classpnp+sys+error&kd=-1&ke=-1&kh=1&kj=b2&kl=us-en&kt=courier&kv=1&k1=-1&k4=-1 (I like this search engine better).
 

Best of luck.


Edited by scotty_ncc1701, 14 June 2014 - 09:23 AM.


#3 dc3

dc3

    Bleeping Treehugger


  • Members
  • 30,690 posts
  • OFFLINE
  •  
  • Gender:Male
  • Location:Sierra Foothills of Northern Ca.
  • Local time:03:54 AM

Posted 14 June 2014 - 10:48 AM

Instructions for a Windows 7 Repair installation.
 
A Windows 7 Repair Installation will require a installation disc.
 
If you do not have a Windows 7 installation disc you can download a free legal ISO image of Windows 7 SP1 at  Windows 7 Forums.  You will need to download the same version of Windows 7 that you have installed,  This image is hosted by the Digital River store which is an official distribution partner of Microsoft.  This is a genuine untouched image which is safe to download. 
 
Attention:  If you do have a Windows installation disc, skip Part A and go to Part B, Step 1b.
 
Part A, Steps 1a - 6a
 
How to burn ISO image using Windows Burn Disk Image.
 
Notice:  This applies only to Windows 7 and Windows 8, earlier versions do not have this.
 
1.  Place a blank CD or DVD in the tray of your optical drive and close the tray.
 
2.  After you have downloaded the ISO image you want to burn right click on the Start orb, then choose Windows Explorer.
 
3.  When Explorer opens click on Downloads in the left pane.  Scroll down till you find the ISO file you want and double click on it.  Click on Burn Disk Image.
 
4.  In the image below you will see Dick] burner:, this should be set to the optical drive you want to use.  Click on Verify disc after burning if you want to Windows to verity the disc image after burn.  Click on burn.
 
burndiskimage1_zpsb502b181.png
 
5.  In the image below you can see that the green progress bar, when the image is finished burning the bar will be filled.
 
burndiskimage2_zps17a9d6ff.png
 
6.  After the image has completed being burned click on Close
 
Please note:  In order to boot from this DVD you may need to change the boot order in the BIOS so that the CD/DVD-ROM is the first device in the boot order, and the hdd is the second device.
 
 
Part B, Steps 1b - 10b
 
1b)  Place the installation disc in the tray of the CD/DVD drive, close the tray and restart the computer.
 
2b)  You will be prompted to press any key to start the installation, I find the space bar handy.
 
At this point the setup process will load files, this will take several minutes.
 
3b)  You will now need to choose the  Language, Time, currency format, and Keyboard or input method that you'd like to use.
 
After this is done click on Next.
 
w71_zps6dbda47e.png
 
4b)  Click on the Repair your computer link at the bottom-left of the Install Windows window.
 
This link will begin the Windows 7 System Recovery Options.
 
w72_zps2a656a0c.png
 
5b)  System Recovery Options will now search your hard drive(s) for any Windows 7 installations.  This will take several minutes.
 
No participation is required on your part at this time, wait till it has finished and the next window opens.
 
w73_zpsd5483f05.png
 
6b)  Choose the Windows 7 installation that you'd like to perform the Startup Repair on, then click on Next
 
w74_zps490f9a17.png
 
7b)  Click on the Startup Repair link from list of recovery tools in System Recovery Options.
 
w75_zps9941e858.png
 
For a future reference, there are several other diagnostic and recovery tools available in the Windows 7 System Recovery Options including System Restore, System Image Recovery, Windows Memory Diagnostic, and Command Prompt.
 
8b)  The Startup Repair tool will now search for problems in the system files.
 
If Startup Repair finds a problem with any system files the tool may suggest a solution which you will need to confirm, or may solve the problem automatically.
 
w76_zps3dd75d83.png
 
9b)  Startup Repair will now attempt to repair whatever problems it found with system files.  
 
Note:  If Startup Repair did not find any problems with system files you won't see this step.
 
w77_zpsd8be95eb.png
 
Important: Your computer may or may not restart several times during this repair process.  This is normal, you should allow it to continue until you see the Restart your computer to complete the repairs window. 
 
10b)  Click on Finish, this will restart your computer.
 
w78_zpsd49257fb.png
 
It is possible that the Startup Repair will not be able to fix the problem.  If the Startup Repair tool determines this, it may automatically run the the repair after your computer restarts.  If it does not automatically run the repair but you are still having problems with Windows 7 repeat these steps to run Startup Repair again manually.

Family and loved ones will always be a priority in my daily life.  You never know when one will leave you.

 

 

 

 


#4 wpgwpg

wpgwpg

  • Members
  • 1,149 posts
  • OFFLINE
  •  
  • Gender:Male
  • Location:US of A
  • Local time:06:54 AM

Posted 14 June 2014 - 10:50 AM

 CLASSPNP.sys is part of the support for SCSI devices.  Most computers don't have internal SCSI devices (they're used more on servers), so I'm thinking this could be caused by some externally attached device.  Try unplugging everything except your keyboard and mouse and see if the computer will boot.  If so, it's just a matter of isolating the problem device by trial and error.

 

Good luck.


Everyone with a computer should back his system up to an external hard drive regularly.  :thumbsup:

#5 wpgwpg

wpgwpg

  • Members
  • 1,149 posts
  • OFFLINE
  •  
  • Gender:Male
  • Location:US of A
  • Local time:06:54 AM

Posted 14 June 2014 - 10:54 AM

 DC3, you posted seconds before I did!  You can create your own repair disc on another computer (32 or 64 bit same as yours) by going to Start -> Control Panel -> Backup and restore -> Create a system repair disc.  Use a blank CD-R.


Everyone with a computer should back his system up to an external hard drive regularly.  :thumbsup:

#6 cbblake1

cbblake1
  • Topic Starter

  • Members
  • 34 posts
  • OFFLINE
  •  
  • Local time:05:54 AM

Posted 14 June 2014 - 06:28 PM

Thanks, guys, for the help! I am currently at work, so I will give these a try in the morning.

 

Best regards

 

CB



#7 cbblake1

cbblake1
  • Topic Starter

  • Members
  • 34 posts
  • OFFLINE
  •  
  • Local time:05:54 AM

Posted 17 June 2014 - 08:21 AM

I want to thank everyone for their suggestions! Unfortunately, nothing worked. I was left with doing a format and fresh install. As this saga continued, the CPU began overheating during the install, and the computer shut down unexpectedly. After reboot, Windows continued and finished, but the computer shuts down after a while, without warning. The CPU is toast.... Maybe this was the trouble all along, I don't know for sure, but it does seem coincidental...

 

Again, thanks to all for your input, it is greatly appreciated!

 

CB



#8 Kirbyofdeath

Kirbyofdeath

  • Members
  • 459 posts
  • OFFLINE
  •  
  • Gender:Male
  • Location:Somewhere on Earth
  • Local time:05:54 AM

Posted 17 June 2014 - 09:42 AM

The CPU is NOT TOAST! All you need to do is to clean out the computer and reapply thermal compound between the cpu and the cpu fan!



#9 dc3

dc3

    Bleeping Treehugger


  • Members
  • 30,690 posts
  • OFFLINE
  •  
  • Gender:Male
  • Location:Sierra Foothills of Northern Ca.
  • Local time:03:54 AM

Posted 17 June 2014 - 10:23 AM

The fact that the computer starts at all should be an indication that the CPU is not toast.  I concur, clean both the CPU heat spreader and the heat sink and reapply the thermal compound.

 

You can use a plastic card (debit, credit, library, etc.) to clean off most of the old thermal compound.  The remaining residue can be cleaned of the surfaces with isopropyl alcohol.

 

When you apply the thermal compound you will only need a small amount, a drop about the size of a grain of rice.

 

I would suggest that you use a good quality compound, like Arctic Silver 5. 


Family and loved ones will always be a priority in my daily life.  You never know when one will leave you.

 

 

 

 


#10 cbblake1

cbblake1
  • Topic Starter

  • Members
  • 34 posts
  • OFFLINE
  •  
  • Local time:05:54 AM

Posted 18 June 2014 - 07:30 AM

Hmmm.... OK, I am certainly up for trying the Arctic Silver. Cheaper than a new MB and processor. After the initial panic, logic does say that the cpu is probably OK. I will cool that puppy down and see what happens. Thanks, guys! I will let you know how it goes!



#11 cbblake1

cbblake1
  • Topic Starter

  • Members
  • 34 posts
  • OFFLINE
  •  
  • Local time:05:54 AM

Posted 22 June 2014 - 08:11 PM

Update: We have success! Got the thermal paste, replaced 2 of the 5 case fans, and the chip temp fell 50%! Windows is now stable, computer is not shutting down!

 

Thank you everyone for all the help!

 

Best regards

 

CB



#12 dc3

dc3

    Bleeping Treehugger


  • Members
  • 30,690 posts
  • OFFLINE
  •  
  • Gender:Male
  • Location:Sierra Foothills of Northern Ca.
  • Local time:03:54 AM

Posted 23 June 2014 - 11:45 AM

Happy computing.


Family and loved ones will always be a priority in my daily life.  You never know when one will leave you.

 

 

 

 





1 user(s) are reading this topic

0 members, 1 guests, 0 anonymous users