Not sure if your installed version of Windows is 32-bit or 64-bit? One quick way to tell is by looking at information about your operating system installation in Control Panel.

Your new computer has a 64-bit processor, but your software probably is still 32-bit. Why haven't software developers done more about it?

Should I use 32 bit or 64 bit? I'm only using 2 GB of RAM (and I think it only supports 4 GB at the very most) but it does support 64 bit. I've installed Windows 7 x64 and it seems quite a bit ...