games run perfectly fine in 64 bit Windows. Some older (7+ years) games may have trouble installing in the first place, but applications were never really an issue for 64 bit Windows, drivers were (stressing "were"). For ram, I always say the more the better, but try to aim for between 4GB and 8GB. If you going to be gaming quite a bit, go for 8GB. If games are only going to be a casual use for this machine, stick with 4GB if you want to save some cash.