WinXP login problem

WinXP Home SP2, maybe SP3 - the PC boots to the Welcome screen, then loads to the user log in screen and says "To begin, click your user name" but there is NO LIST of users!!! There's no user symbols or avatars, nothing. The same thing happens in normal mode or safe mode. I was hoping that in safe made it would at least show the Administrator account, but nope. So, to sum it up, the system boots to a blank log in screen showing no user accounts and no avatars. Any thoughts, ideas, suggestions, or links will be greatly appreciated!!!

[dlb]

 

Hey dlb after a quick search i have seen pressing >> ctrl + alt + del << at that screen mentioned few times have you tried that yet?

Sounds like virii to me

Q

EDIT: press that sequence of keys twice apparently