SOS, Xp is constantly rebooting itself and can not go in to os

Hello,
Hopefully some one can help. I will try to keep this short and sweet.
I think I have some kind of virus on my WINXP because before my system crashed and began resetting itself for some odd reason a second user named “hack” would show up on my pc after startup. To remedy this I would delete the user name and it would occasionally go away.
The problem is that my system is consistently crashing and it won’t even boot up on safe mode. So I tried to reinstall xp and use the repair option. Unfortunately it keeps asking for an admin password and I never had one.
I suspect that it must be a virus but does anyone know how I can bypass the system?
:cry

 

:wave and welcome to MG's..

i have asked for this to be moved to the malware forum.

in the meantime you need to look at this.

Malware question? (Virus, trojans, spyware, etc)

good luck.