[luqman]

version: xp sp2
hp desktop

the sequence of problem!
> Logon Screen
> Logging On
> Loading personal settings
> Logging off
> Saving your settings
> Logon Screen again

the system was initially having AVAST antivirus running but yet the prevalence of Trojan malware.

I uninstalled the AVAST antivirus and replaced it with MCAFEE antivirus. I was running the MCAFEE system registry clean up when the system went off.
Upon restarting, the above sequence of problem begin.

How can I restore the system back without loosing any data as data in the volume is very important.
I need help!