I haven't thought of Windows 7. I was just thinking on the boot up times more than anything.
I forgot to add that the old PC is the second pc the arcade machine has gone through. The first PC died with bulged caps that finally took the machine out (I got it it too late and didn't notice the caps). I found and exact model and swapped the hard drive out and am running it now. The newer pc that I would use is built much better with quality caps too.