I got windows vista home premium with Mcafee anti virus enterprise, from about 2 weeks the security center show an exclamation mark mean that this program not compatible in somehow with windows in another hand the program work but the security center can't report or monitor this application to keep it updated, so my question is can any body tell me what's going on with VISTA and also this happen with windows 7.

Hi, thanks for the post. I suggest we first perform the following steps to rebuild the repository folder and then check the result: 1. Click the start button and search on the word "CMD" - "CMD.exe" should appear. 2. Right click on it and select "run as administrator". 3. In the command window at the prompt type each line and press Enter: net stop winmgmt cd c:\windows\system32\wbem ren repository repository.old net start winmgmt 4. Then, please restart the computer and check the result. You can also check the following thread: mcafee virus protection turns off http://social.technet.microsoft.com/Forums/en-US/itprovistasecurity/thread/c1acad2f-a48b-4202-94ec-aa0ac0ea3a62 Hope this helps!Sean Zhu - MSFT