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Buffer Overflow Cannot log on


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#1 JJ2K

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Posted 26 February 2009 - 08:08 AM

Hi,

I was advised in my topic to repost here :

When I try to boot up my P.C and it comes to the Windows is starting up I get the following message:

Title: Microsoft Visual C++ Runtime Library
Error: Buffer overflow detected.
Progroam :\??\C:\Windows\System32\winlogon.exe
A buffer overrun has been detected which has corrupted the programs internal state and has been terminated.

Then you can only press ok and it freezes on the windows is starting up so i cannot logon.

I cannot logon in safe mode either, and have tried last known good configuration.

what else can i try please help!

my pc is packard bell 512mb ram windows xp sp 3

before this happened i had installed 1 program, uninstalled another, had been browsing the web and had also installed 1 windows update before the computer shutdown. then i restart and i get this

I can access Recovery Console if that helps.

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#2 DaChew

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Posted 26 February 2009 - 08:37 AM

Can you get to a command prompt from safe mode choices?
Chewy

No. Try not. Do... or do not. There is no try.

#3 JJ2K

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Posted 26 February 2009 - 08:56 AM

I am running CHKDSK atm and can't seem to cancel it..so could be a while

But I can get into Command Prompt inside Recovery Console
And I would assume that I can get into it through Safe Mode Choices, what would you reccomend if I can?
On another note I have also found Ultimate Boot CD v4.1.1 so I can boot into this, if it helps at all no idea on what it does.

#4 DaChew

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Posted 26 February 2009 - 09:17 AM

But I can get into Command Prompt inside Recovery Console
And I would assume that I can get into it through Safe Mode Choices, what would you reccomend if I can?


I wouldn't assume that

You can access system restore from a safe mode command prompt but not from the recovery console

http://xphelpandsupport.mvps.org/how_do_i_...stem_restor.htm
Chewy

No. Try not. Do... or do not. There is no try.

#5 JJ2K

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Posted 26 February 2009 - 10:22 AM

You are correct I cannot get into SafeMode Command Prompt.

I have just tried the system restore from the recovery console but it didnt help.

The system will load up as normal, and then when it gets to the Welcome Screen the error exactly comes up:

Microsoft Visual C++ Runtime Library

Buffer overrun detected!

Program: \??\C:\WINDOWS\system32\winlogon.exe
A buffer overrun has been detected which has corrupted the program's internal state.The program cannot safely continue execution and must now be terminated.

Then it just freezes on the Welcome Screen with text Windows is Starting Up... after I press OK on the error. What does the \??\ mean before my drive letter?

I have a feeling everything is OK behind it. I have seen people with this error against programs like explorer.exe and firefox.exe, but unluckily for me it is against winlogon.exe so i cannot log on. Anyway to bypass the logon screen altogther?

But if I replaced the winlogon.exe in \system32\ with one from c:\windows\i386 then if it was a problem with this file it would have solved it?

Edited by JJ2K, 26 February 2009 - 10:24 AM.


#6 DaChew

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Posted 26 February 2009 - 10:41 AM

But if I replaced the winlogon.exe in \system32\ with one from c:\windows\i386 then if it was a problem with this file it would have solved it?


That would be the next step for me
Chewy

No. Try not. Do... or do not. There is no try.

#7 JJ2K

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Posted 26 February 2009 - 11:08 AM

OK well in recovery console I replaced \system32\winlogon.exe with:

windows\i386\winlogon.ex_ which was 516608 bytes
and then windows\servicepackfiles\winlogon.exe which was 507904 bytes

none of them made any changes and the error is still coming up! This makes me think the problem is not within winlogon.exe.

#8 JJ2K

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Posted 27 February 2009 - 09:53 AM

Is there anyone that can help out there.

Why is the file being listed as \??\C:\\windows\system32\winlogon.exe

What does the \??\ mean here ? I think this could help in reaching the problem.

#9 DaChew

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Posted 27 February 2009 - 10:22 AM

http://www.bleepingcomputer.com/forums/ind...t&p=1153488

2.Don't know exactly what it is but it takes me to a windows setup screen where it says press R as suggested earlier but this just takes me to the recovery console rather than repairing a bunch of files as you may have suggested.


http://www.michaelstevenstech.com/XPrepairinstall.htm

you selected R too early
Chewy

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#10 JJ2K

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Posted 27 February 2009 - 11:09 AM

The repair install will not delete my personal files will it?

#11 DaChew

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Posted 27 February 2009 - 11:30 AM

http://www.michaelstevenstech.com/cleanxpinstall.html

This would delete all information/data

I know it's intimidating but they give you choices and then ask for confirmation.
Chewy

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#12 JJ2K

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Posted 27 February 2009 - 01:03 PM

OK well it seems this CD was just there simply for the recovery console and actually doesn't have the repair install loaded onto it.

I will have to ask around to find somebody with an XP CD.

Is there any ISO I can use for a repair install?

Until then is there anything else i could try out, there's nothing around on google for my problem it seems.

#13 DaChew

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Posted 27 February 2009 - 01:10 PM

Is there any ISO I can use for a repair install?


That would be very nice of microsoft wouldn't it?

I wonder how many people have gone out and bought another copy of windows?

You have to make sure the copy of windows matches the one installed
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#14 JJ2K

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Posted 28 February 2009 - 03:38 PM

Well what does one do.

My P.C was bought from P.C World and already had XP Home installed on it, I wasn't given a CD.

I need to do a repair install or a fresh install by the looks of it, what options do I have?

Also is it possible to back up my hard drive to a USB? Apart from my personal files is there anything else, e.g any windows files i should back up?

#15 DaChew

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Posted 28 February 2009 - 03:49 PM

Why don't you start a parallel thread in the windows xp forum with a link back here to this thread, our recovery console experts might be able to help you there.

http://www.microsoft.com/downloads/details...;displaylang=en

Here another tool, you would have to download and burn on a working computer

Microsoft Diagnostics and Recovery Toolset
Chewy

No. Try not. Do... or do not. There is no try.




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