I did a quick Google search and this seems to be a legitimate project out of Stanford - go to Google and enter "Folding@Home" into the seach bar.

Wikipedia has a nice explanation of the project http://en.wikipedia.org/wiki/Folding@home

Having said that, I, for one, am not willing to download this as I don't like to put anything on my computer that could compromise it in any way...

Ginny M. SCC of Left lateral tongue Dx 04/06,Surgery MDACC 05/11/06: Partial glossectomy with selective neck dissection. T1N0M0 - no radiation. Phase III clinical trial ("EPOC" trial)04/07 thru 04/08 because tests showed a 65% chance of recurrence. 10 Year Survivor!