system
11
Allow me to update you on the issue.
I was following the information given by Essexboy (http://forum.avast.com/index.php?topic=53253.0), as follows:
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I have installed Malwarebytes’ Anti-Malware.
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I ran it.
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It found no viruses in MBR, but found one in a completely different file, an executable downloaded from the internet.
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I have removed the infected executable file by Malwarebytes’ Anti-Malware.
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And that was it, the virus in MBR is now also gone. I checked it several times with avast! Internet Security and Malwarebytes’ Anti-Malware.
I don’t understand what really happened, but I guess that the infected executable file was contaminating my MBR. The trouble is, avast couldn’t find this file, and was repairing MBR only. I could be wrong.
Anyhow, my system seems to be clean now.
Thanks again to Pondus and Essexboy 