system
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In response to your reply David:
"The reboot shouldn’t cause the the virus to kick in again and reinfect the MBR if it was only the MBR rootkit present. You also said “I am now frightened to press Fix in case it reboots me to the previous state” and you later downloaded and ran TDSSKiller. So I don’t see where you ran aswMBR and clicked the Fix option, confused.
The aswMBR log you posted doesn’t show the presence of an MBR rootkit but the default MBR."
The first time I ran aswMBR.exe it detected the rootkit, When I hit Fix, the computer went black and went to reboot. At this stage I had to again reinstall from advanced repair options as the computer would not boot as the boot sequence was once again missing. Once reinstall was complete, I again downloaded a fresh copy of aswMBR and checked to see if the fresh install had cleared the infection, but alas the rootkit was still present. I did not want to hit Fix again. I reread the post by essexboy which did not say to press fix so I googled for additional advice.
The advice I then found suggested to download tdsskiller.exe and I figured at this stage it was worth the risk. tdsskiller removed the rootkit and after a reboot aswMBR.exe showed the log which I pasted here (the one you are referring to as clean).
Does that make more sense?