During the scans was anything detected and removed or quarantined?
What changed in your system shortly before the problem occurred? Knowing
about a setting change or added software or hardware may be helpful in
solving the problem.
Since you haven't told us anything about your computer, operating system,
antivirus, etc. all I can suggest is that you go through the preparatory
work here: http://support.microsoft.com/kb/555375
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