When ever i try to log in it logs me out instantly event in safe mode and when i start up it say primary hardrive not found now i might have turned in on when you go on the set up menu but i dont know how to turn it on please HELP my computer is my life.

Also before this happen i had like 47 trogent viruses but i got rid of them with avg
Your only option may be a repair install with the windows disk...Is this XP, Vista or Windows 7?

Otherwise in the Advanced startup menu try selecting last known working configuration. It could simply be the virus has used a logout exploit on your ACCOUNT. if you re using XP Pro, try pressing control - alt - Delete twice at the login screen. This will bring up a login box. in the username field type in administrator and leave the password blank. (unless you know you changed it when you first got the computer) and press ENTER and SEE if that will log you in.ok how do i repair the xp computer cause if i can't log on i can't use the disk right? AVG doesn't specialise in removing all Trojans...you're most likely still infected...

Visit Our Virus and Spyware section and FOLLOW the instructions at the top of the page and Post your logs...