system
15
so your real problem is upgrading to version 5 or 6. Have your tried, updating your systems to the latest service packs. Usually I have this same problem, when I use pirated versions of Windows (not saying that you do) because certain registry tweaks are applied during install that makes system act as if it were a server instead. So if everything is legit with your installation, I would try updating the system (don’t worry about drivers) the most you can, and don’t worry about system “security” updates (especially on Windows Vista and 7, they cause more problems than fixes).
Also, if you have licensing problems you have to do the slow reformat every time.