Thank you for you help in advance! In stalled the window xp pro 64 bit, activated, worked fine. Then I have taken the batteries on my motherboard out to reset the detection of the HDD, and window load fine. Then next time I turned on my computer windows ask me to activate again before I can log on to the desk top. I click to activate, window accept the activation, and try to load the desk top. BUT it cycle back to the user icon, displaying adminstrator, click to log in, request again for activation, click to activate, and the cycle continues w/o end. I went to restart in safe mode, able to log in the desk top, activate there and was accepted, restarted in normal mode. The same cycle of requesting to activate happens again. I went to Microsofy website and found this site: support.microsoft.com/kb/947518/en-us However, this site fixes the IE problem for downloading. My problem is not be able to log into desktop and premanent disabling the activation. I believe there's a simple fix :0 Please help! Thank you again.