Geekbench is a processor and memory performance benchmarking application which will stress test your system to give you an idea about how capable is your system in processing. Download it here.
I tested my notebook running Windows 7 ultimate, and it scored a fair 2677! Here is the result page for my benchmark.
By the way, I was surprised to see the top scorers. Data centre servers with 80GB RAMs, multi deca core processors!!!! lol Check the result browser yourself.