This looks like a keyboard and a mouse (of some ports on the motherboard) gone south. Things to try:
- another keyboard, and another mouse
- see if you can get into the BIOS: press f1 or f10 or del or a host of other keys depending on the make of your computer; if it works you hit the right key and your keyboard is working; if it doesn't work either you didn't press the right key at the right moment, or some hardware is broken
- set the BIOS to boot from A: first
- boot from a virus-free boot diskette, and see if the keyboard is detected and working
- depending on the boot diskette, you might have mouse support also (but there must be a DOS-mousedriver installed for that).

I don't really believe in a virus here.

Hope this helps.


Kees