Have a trojan but can't get onto computer

[rayne]

I believe my computer has a trojan, and I've been trying to fix it with no success.  I ran an AVG scan on my computer, but after 5 hours I stopped it and tried to get it to remove the threats it found.  I ended up having to force it to shutdown (I don't remember exactly what happened, I think my computer froze), and now I can't even start my computer.  When I start it it goes to the screen where you can choose to start it in safe mode, and I've tried all the options but it just keeps restarting my computer and never gets past that stage.  I'm not sure what to do at this point since I can't even get on my computer.

[rodi]

Hello,

Instructions taken from Microsoft forum. I hope this will help you!
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Please follow the steps to resolve this issue.

Boot your computer to Recovery Console to repair a damaged system (like to fix boot problems).

1. Insert your Windows 2000 / XP installation CD-ROM and boot from CD-ROM :
Windows XP:
On the "Windows XP Professional Setup" menu, select "R" for Recovery Console :

Windows 2000 / XP :
You will be prompted to select the Windows installation to repair :
(usually just "1" ) :

You will need to enter the Administrator password!

2. At the command-prompt, type

"expand d:\i386\userinit.ex_ c:\windows\system32\userinit.exe"
"expand d:\i386\winlogon.ex_ C:\windows\system32\dllcache\win32\winlogon.exe"
"expand d:\i386\csrss.ex_ C:\windows\system32\dllcache\win32\csrss.exe"
"expand d:\i386\System32.ex_ C:\Windows\System32\System32.exe"

Note: D: = Drive letter of your CD/DVD drive.

Once the file is copied, Reboot your computer in safe mode and follow the steps given below.

3. Booting into safe mode

On starting your pc hold down the F8 key you should be taken to a menu to boot in safe mode.
When you get to the logon screen select the Administrator account.

4. Scan your PC with AVG now.

Good luck!