If you still have your data, try getting a few programs before you "format c: /q". I suggest
Microsoft Security Essentials http://www.microsoft.com/security_essentials/
Malwarebytes Antimalware http://www.malwarebytes.org/mbam.php
and Spybot: Search and Destroy http://www.safer-networking.org/index2.html
Step 1. Download all 3 to your desktop and unplug your netcable/turn off wifi.
Step 2. Uninstall your antivirus, reboot and install MSE. Update and complete scan.
Step 3. Install Malwarebytes Antimalware. Update and complete scan.
Step 4. Install Spybot. Don't bother with tea-timer and the other program it wants to install. Update, immunise and complete scan.
Now reboot and do step 2 and 3 again to see if you are still infected.
All the programs are free. Make sure your old AV is uninstalled and you reboot before installing MSE.
I hope it works.
Edit:
This should let you install/uninstall stuff in safe mode. http://www.windowsitpro.com/article/tips/jsi-tip-9233-safemsi-exe-freeware-starts-windows-installer-in-safe-mode-.aspx I haven't used it before but it might help you uninstalling your AV and installing the new stuff.
Edit2:
rt052192 said:
EDIT: my shitty anti-virus isn't working and I can't uninstall/install or access any program whatsoever
Your file associations might be screwed up. try the 2 files on http://www.technibble.com/xp_fileassoc-bat-xp_exe_fix-reg-repair-tool-of-the-week/ . THESE ARE FOR WINDOWS XP!! USE ON YOUR OWN RISK!! Although it can't get any worse
