Well I would have though that the /fixmbr command should have set it back to a default MBR and not an unknown one, which is normally associated with either a dual boot system or something like a Dell or HP which might have a custom MBR to allow access to its recovery partition. So do you have a Dell/HP or other manufactures system ?

Well in a way that’s not good in that TDSSKiller didn’t find anything, so this is going to need investigation by someone more experienced than in malware removal using more analysis tools. I will try and get someone to take a look at it, but they are likely to be in bed now (UK time 00:05am). So it would be much later today before they are back on the forums.

When you say this happens 8-12 consecutive times, perhaps this to simplistic, but you could check your task scheduler and see if there are any tasks there that you didn’t create.

You could also try this little tool, svchostanalyzer.exe (http://www.neuber.com/free/svchost-analyzer/index.html) and see what is assigned to the ID of the svchost.exe taking up the high cpu%