Yes i have to format and re-install. But still not decided what to select.. I suppose to play new games. Anybody know how many amount of ram needs for two OSs for itself??
First of all, you can use only one OS at a time. Therefore, you just have to look at the most RAM hungry OS, that is 64 bit. As I said before, 2GB minimum for 64 bit and with 4GB you are fine for gaming. Install both and use one at a time. Install the older one first, that is XP if you are still using it.