Is there any free utility that can be downloaded

What exactly do you want to test? Can you give us a better idea of exactly you want to prove - i.e. is something broken or do you want to see if your PC is up to scratch?

For a general stress test you could try the evaluation of this - http://www.passmark.com/products/bit.htm .

If you just want to monitor temperatures etc. I recommend MBM5 - http://mbm.livewiredev.com/

Or if you just want to see how well your PC handles games etc. try - 3DMark - http://www.futuremark.com/download/ (also got a limited free version).

Hello,

It appears the MBM5 Link doesn't work - but if anyone is interested in downloading it you can get it from pcworld.com at: http://www.pcworld.com/downloads/file_download.asp?fid=7309&fileidx=1

Sorry - forgot the http. It'll be fine now.

Even after you fixed the link, I can't get it to open. It appears the page won't load.