i have 8 updates available but when try to download after a while it give me error code 646 and none update is install

Hi, What Operate System are you using ? Please read the Windowsupdate.log to check if there is any related error code or error message. Refer to: How to read the Windowsupdate.log file http://support.microsoft.com/kb/902093 Meanwhile, you can try to manually download and install these updates. Go to Microsoft Download Center and put in the KB number to download it: Microsoft Download Center http://www.microsoft.com/downloads/en/default.aspx If the problem continues, please revert back with the error code or error message you encounter. Regards, Bruce

Error 646 apparantly means:"unknown error". Those are the worst kind. Maybe this thread will help: http://www.vistaheads.com/forums/microsoft-public-windowsupdate/322548-error-646-a.html Good business is where you find it. Trust will empower your Endeavour. Reliability and transparency shall form strong partnerships. Nothing exceeds lifes excess.