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No boot for windows 7 after malware infection


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#1 seansangel

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Posted 19 October 2013 - 09:31 PM

the HP pc is running windows 7 Ultimate 64 bit.  I had all the computers on my network infected with a back door trojan but this one was worse off it seems and probably for longer.

It now will not boot at all.

I have a dual boot for Linux on the system but do not feel capable of going farther.  I have burned a repair disk and it is not working either. 

I have also worked in the command prompt to rebuild and fix the boot...it does not find it.

I think I need some awesome bleeping computer guidance lol

Thanks so much.

 



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#2 cryptodan

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Posted 19 October 2013 - 10:15 PM

Will it not work in Safe Mode?

#3 seansangel

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Posted 24 October 2013 - 12:16 PM

No there is no boot at all.  The repair disk does not work either.

There is a message that comes up about the RAM being bad though which I have never seen before.  I have been battling a nasty trojan infection in my network and I believe this computer is still infected because when I boot through the linux side I can see the files left by the same virus that was on my laptop. 

Could this RAM message be sent due to the infection or is something else going on?

I am in over my head lol



#4 cryptodan

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Posted 24 October 2013 - 06:26 PM

Please download and burn Memtest86+ and then go into your BIOS and change the boot order to CD-ROM and perform a memtest let it run over night.

#5 seansangel

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Posted 25 October 2013 - 12:54 PM

I have made the disk and will run tonight.  Let you know how it goes :)

Thank You



#6 seansangel

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Posted 26 October 2013 - 04:52 PM

Ok the run is over...there is nothing visibly different is there a second step?



#7 cryptodan

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Posted 26 October 2013 - 06:37 PM

Were there any errors?

#8 seansangel

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Posted 27 October 2013 - 07:26 PM

OK it had re-booted and had no error messages and when I re ran it the end flashed so quickly I could not read it...so I redid it again while I was watching.

It flashed very quickly a few lines the gest of which was "PXE E53 No boot recieved"



#9 cryptodan

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Posted 27 October 2013 - 07:54 PM

Go into the BIOS and see if your boot device has changed from HDD to Network?

#10 seansangel

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Posted 29 October 2013 - 12:31 AM

[quote name="cryptodan" post="3192100" timestamp="1382921670"]

Go into the BIOS and see if your boot device has changed from HDD to Network?[/quote

That is interesting. It is set to my external hard drive and no option for HDD. When I Look for HDD anywhere through windows boot it doesnt see that it exists but when I boot through linux it is clearly all there. ]

#11 cryptodan

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Posted 29 October 2013 - 05:42 AM

do this, unplug the system, then remove the battery and find the clear CMOS jumper on the motherboard (consult your motherboard manual), and then move it back to normal, add the battery, then plug it back in and power on and see if it boots to windows.

#12 seansangel

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Posted 29 October 2013 - 09:26 PM

ok we have the HDD showing and it is trying to boot from that but no beans.  It starts with the repair screen and stays there just like before.



#13 cryptodan

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Posted 30 October 2013 - 05:32 AM

Can you try loading up in Safe Mode via hitting F8 just after the BIOS Screen?

#14 seansangel

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Posted 30 October 2013 - 09:35 AM

The result is the same... stuck on repair screen :(

#15 cryptodan

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Posted 30 October 2013 - 04:58 PM

Can you enter the advanced start up options via hitting F8 after BIOS post, and if so can you start the Repair Options and go to Console and type in chkdsk /f?




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