I ran combofix after it was complete it said something like, let combofix reboot your PC. It stayed like that for a while so finally i just hit the power button.

Now I get an error at boot up:

STOP: c0000218 {Registry File Failure}
The registry cannot load the hive (file):
\SystemRoot\System32\Config\Default or its log or alternate.
It is corrupt, absent, or not writable.

Beginning dump of physical memory.....................

I tried "last known good configuration" , same problem. Safe mode doesnt work either.

Any ideas?

I booted off the windows xp cd into recovery console and ran this command copy c:\windows\repair\default c:\windows\system32\config\default

It also seems like the virus is gone

Hello there and welcome to BleepingComputer. My name is Charles and I will be dealing with your log today.
As you can probably see our HijackThis Team is incredibly busy at the moment, but I apologise for the delay you have experienced. If you are still having problems please post a brand new HijackThis log as a reply to this topic. Before posting the log, please make sure you follow all the steps found in this topic:
Preparation Guide For Use Before Posting A HijackThis Log
Thanks,
Charles