Sounds like an old activation problem. I'd turn off AV, malware programs and firewalls and let your PC have full access to MS servers and its servers to your PC.
so after i update my service pack to sp3, i restart and get this error - A problem is preventing Windows from accurately checking the license for this computer. Error Code: 0x80004005
i've tried the MS solution and couldn't get passed this step - Type cd %SystemRoot%\System32 - because it says doesnt recgnize command. ive been able to add another hard drive so that i can back up some info so i actually have excess to it, is there anyway to fix it that way????