i know what iam doing so turn off the UAC. but then i purposely test the UAC function by using 'BRONTOK' email virus. First, i turn on the UAC, and downloading the brontok virus. while it can detect and prompt me what should i do? that time i havent installed the antivirus. Ok, i know it is virus then stop it. But if the moron users of coz will alow it, so UAC will be defeated by inexperience users. Although UAC works but i would like to disable it for messing purpose, so i can learn from what i have met... turn on UAC is good, but you wont learn anything from solving problem. You are living in protected case, you wont be growth and knowledge is limited.