The malware has corrupted or deleted your winlogon files, you need to do a Windows repair from your XP Disc.
To be honest i would get a new laptop ASAP as that model has a manufacturing fault, has your wireless card given up yet? That is the first of an amalgamation of troubles eventually leading to DEATH. I have had 5 or 6 of these models in my workshop in the last 6 months all with the same faults, HP extended the warranty on these machines by a year but stopped short of recalling them. The problem is the cooling system which causes components surrounding the CPU to start failing and burning out, the wireless chip being the firsr and eventually the video chip, which is on board and can not be replaced. HP machines are cheaply made. Can't go wrong with a Dell or a Sony
Edited by longtooth, 09 January 2010 - 12:08 PM.