Welcome ...
I also had it. I have the same system as you, only that the Home Premium.
I solved this riddle, but in the 7.x I have also just had the installer.
The point is that the installer does not recognize bit version of the system and you need to fire up the installer yourself adequate compatibility of Win XP SP3 + option run asadministrator.
For me it worked, maybe it will help you:)
Let me know ...