The Security Forum loves to help people kill such things. But a name helps.
As to the hangup, that could be hardware issues. Try the case cover off (helps alleviate heat issues), use just the RAM that it came with (some add more than 512 Meg and that has its own issues.)
And if you've added CD/DVD or hard disk drives, some restore CDs can't cope with that.
Bob
Hello:
I am attempting to recover a system (Pavillion 6630) from a trojan that has "control" of the system. I boot from the HP Recovery disk, select recover, format & recover, select "yes" to the warning about deleting everything on the HD, and then the computer freezes.
Any suggestions on how to get the recovery disk to work?
Thanks!
Sleel

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic