My laptop applications wont open & cant download

please can you help me, my laptop will not download anything, i cant open any applications or programmes & even my avast wont work - i get a message saying that they are incompatible but they were ok before i ran a scan
it is a hp pavilion laptop with windows 7.
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  1. Can you do a system restore to known working state ?
  2. ^ try doing restoring to right before the scan.

    What kind of scan did you do?
    What is the exact error message that you are getting?
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