when I turned on my laptop today it was telling me that I had a very serious virus and that my files were in danger. I did have a macfree virus programme instaled I tried to down load another free anti virus software but could not do it. It is a dell computer . What is the best thing to do should I try the dell help line or is it not a problem for them .Should I take it in to a repair place or is this message just trying to get me to buy a new anti virus package.