Login Logout Problems Windpws xp sp2

Hi all,
I have a big problem, when i login windows automaticly logout in all mode (safe mode, normal mode…).
I booted with xp CD and i copied userinit.exe to wsauserinit.exe then i do shkdsk /r but always the same problem.
in the begining i found drivecleaner installed in the laptop compaq nx 6110 i uninstalled her then i do a full scan with norton antivirus he detect me a drivecleaner virus and he delete them and he give me the message you need to restart your computer then i restart but windows can be login.
can you help me.
thinks