1. yes http://www.google.no/search?hl=no&defl=en&q=define:Microsoft+Silverlight&sa=X&ei=9ZVsTbPnKcaaOoHr2YAD&ved=0CBkQkAE

  2. avast + MBAM pro

  3. not necesarry

  4. avast + MBAMpro + SASfree

  5. OK

  6. good, very few FP…but never install more then one AV
    if you do it can create all kind of mysterious windows errors and false positive detections

  7. see 2 and 4

  8. MSE works on XP also