I have used MSE as my anti-virus the past few months and have encountered several infections one of which took complete control of the cpu until I could track it down and terminate the process. Turns out it was the process wmiprvse.exe which ran as a service. I see that others have also encountered this little gem:http://www.neuber.com/taskmanager/process/wmiprvse.exe.html I eventually had to reinstall windows7 to get rid of it completely Also I have just done two quick scans(one with Malwarebytes and the other with MSE). Malwarebytes shows that I have 9 infections and MSE says that I have no threats. Has anyone else had similar or other problems with this product. I have had a few problems with my old anti-virus also, but was always able to rid the sytem of the viruses with combo fix. These were what I would consider minor nuisances.