Go to Start -> My Computer and RIGHT-click My Computer. Choose Properties and wait for the entire window to fill. You will be shown what your processor is, it's speed, and how much RAM you have.
Also, tell us what make/model of computer you have as sometimes the motherboard video chipset will draw on installed RAM for video RAM - and that's not a good thing.
To find out your video chipset, go to the Control Panel and under Administrative Tools start up Computer Management. go down to Device Manager and highlight it. In the right panel, Under Display Adapters it will tell you what your video card and/or chipset is.
Bill