Infected with Trojan Zero Access and Gen Access

I am running Windows 7 32 bit and Symantec Endpoint Protection.  I started getting continual messages about GenAccess, ZeroAccess, etc.  I tried multiple removal tools but when trying to run Power Eraser I get one risk "c:\windows\system32\services.exe" which it can't fix.  I have also tried restoring from a previous restore point but it won't complete either.  Any possible pointers to try and save my system before having to rebuild?

 

Thanks so much for any help!

 

Vicky

 

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