I tried to fix a friend's computer which was infected with many viruses. It is a desktop compac computer with Windows XP SP 2. I discovered the following features and programs were disabled: folder options, regedit, and task manager. The situation was so hopeless that I've decided that the best option was to format the computer and install windows and other essential programs. I tried to do a bit of fixing and cleaning by usind hiren's boot CD, but I douldn't make it boot because the keyboard didn't repond. When I rebooted, the screen gave me two options: (1) boot from Hard Desk or (2) boot from the Cd, and promted me to enter 1 or 2, but when I hit 2 nothing happens. The computer just booted regulary from the hard desk. I tried to go the setup (bios) by hitting F2 as shown on the boot screen, but nothing happens. Instead the computer booted regularly from the hard drive. I also couldn't make it boot in safe mode because again the keyboard didn't respond to hitting the required F key. As a last resort I tried to boot from Windows XP CD, but again I couldn't boot from the CD because the keyboard didn't respond. By the way the keyboaed responds normally when I do word processing. It is PS/2 Keyboard, not a USP one.
I've tried googling around for an understanding or a solution. So far I couldn't find any. I also read this post in one of our forums: http://www.bleepingcomputer.com/forums/t/118993/keyboard-not-responding-can-not-enter-safe-mode/
but it didn't help.
Can Viruses do all that kinds of damaged? Can they destroy the bios? I really don't know what to do with this problem? I appreciate it greatly if any one can make sense out of this crazy problem and suggest some solutions?