I am not using the OEM version of Windows now. I have installed the Windows 7 upgrade that I purchased separately.
Then you wont have that problem. But to support a Athlon II X2+ you need a new mobo since yours is just too old.
Newegg has a combo of the Athlon II X4 620 + mobo for $173 but they also have the Phenom II X3 with mobo for $173 and I would say the Phenom II X3 would be a better deal.