If you want to quickly benchmark or desktop or laptop, and not willing to install any additional software, you may use WinRAR (most of you have it installed i suppose). So, open WinRAR or just any archive you have. Then click Alt+B or Tools→Benchmark and hardware test.
I recommend you closing all the applications and everything from tray for benchmark results to be the maximum.
Feel free to post your results with WinRAR in comments!