Windows XP immediately reboots after login

[Sheila]

PC had indicated viruses last week and tech came and cleaned it up. However,
apparently there is no antivirus program installed. This week noticed
appearance of Antivir08 which I thought was AV put on by tech but found out
it is malware. Shortly thereafter PC cannot be booted other than safe mode
because after Windows login PC immeidately reboots.

I was able to get into Safe Mode and install Malawarebytes Anti-Malware (as
suggested in another forum) which indicated it removed Antivir08 but the
reboot problem persists. Any ideas how to solve this?

Since safe mode is only option to start successfully, I cannot get to
Windows updates or other installs as I get "cannot install in safe mode"
errors.

System is Windows XP Media Center Edition 2002 SP2 on Dell Optiplex GM-280
(Pentium 4).

 

[Malke]

PC had indicated viruses last week and tech came and cleaned it up.
However, apparently there is no antivirus program installed. This week
noticed appearance of Antivir08 which I thought was AV put on by tech but
found out it is malware. Shortly thereafter PC cannot be booted other than
safe mode because after Windows login PC immeidately reboots.

I was able to get into Safe Mode and install Malawarebytes Anti-Malware
(as suggested in another forum) which indicated it removed Antivir08 but
the reboot problem persists. Any ideas how to solve this?

Since safe mode is only option to start successfully, I cannot get to
Windows updates or other installs as I get "cannot install in safe mode"
errors.

System is Windows XP Media Center Edition 2002 SP2 on Dell Optiplex GM-280
(Pentium 4).

Since there was no antivirus installed and the machine was heavily infected,
at this point you'd be best off backing up your data and doing a clean
install of Windows.

http://michaelstevenstech.com/cleanxpinstall.html - Clean Install How-To
http://www.elephantboycomputers.com/page2.html#Reinstalling_Windows - What
you will need on-hand

Malke