Re: Installing Windows 7 64-bit
During an OS Install, your RAM is pushed to the max. Having only 2GB of RAM in your system for Windows 7 should be sufficient, but it will undoubtedly run kind of slow, especially on the install.
I have 6GB of RAM in my computer, and when I was installing Vista 64-bit (I know those are two different OS's) the install process still took quite a while. Just be patient. The progress bar may sit at a certain point (like 2%) for 10-20 minutes. I'm not sure why it does that, but it is actually more common than you may think. That even happened to me with 3x as much RAM in my system than is in yours.
If you're going to be running Windows 7, you may want to look into upgrading your RAM. Try for around 4GB - that will be WAY MORE THAN ENOUGH.
I guess, all in all, just be patient. It will take a while.
CPU - AMD Phenom X4 9500 2.2 GHZ
Motherboard - MSI MS-7374
Chipset - nVidia nForce 750a Sli
RAM - 6GB PC2-6400
Video Card - NVIDIA GeForce 8800 GTS