BSOD after trying to get rid of virus, can't boot

Yesterday I tried to get rid of a virus that Avira kept finding on my laptop but couldn't seem to remove. I downloaded the free comodo antivirus, installed it and without restarting my system I tried to use it to remove the virus. It removed a file services.exe and everything seemed ok. I shut down the computer.

Today I tried starting but I keep getting a blue screen saying "A problem has been detected and windows has shut down to prevent damage.A process or thread crucial to system operation has unexpectedly exited or been terminated
****STOP 0x000000F4 "

I tried starting in safe mode, repairing, and all the options offerred when pressing F8 to no avail

What can be the reason for this and what can I try?


Using Windows 7 on a 64 bit Acer Aspire 5741
 
I did another repair and system restore and at last it did start!!
Hopefully there aren't any viruses and other problems still lurking and you won't hear from me again
 
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