Ok, There seems to be a Big problem With the Windows 10 Upgrade, Do Not Upgrade to Windows 10.. If you want to try Windows 10, Then It MUST be a FRESH install.. If you have already tried the upgrade and it messed up your computer, I would Downgrade back to what you had before..
I've upgraded 2 Windows 7 Ultimate rigs without hassle so far as I can tell. The problems I'm aware of seem to stem from the Microsoft App Store (or whatever they call it).
I have done 6 computer so far that has had problems with there upgrade, and another 3 more to fix this week.. Also better check your Privacy setting, by default setting you are agreeing with all Microsoft garbage, most is spyware. Click on privacy settings and remove ALL checks..
Just did another upgrade yesterday, besides taking 5 hours, after it reboots for the last time it keeps wanting to update over and over again...
I've never tried Windows 10 because of the bad reviews I read online and from the people around me. They actually had a hard time using Windows 10 and most of the time they were totally lost. Actually as of now I'm on Windows 7 still and I'm perfectly fine with that.