A newer version of SETI@home is available.
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Full user review
"I use it...I like it!"
It's fun to be a part of the search for extra-terrestrial intellegence...I've been using this program and variations of it for more than 2 1/2 years and it has never caused me a problem with my computers!...I run it on 3 computers and although it will bring CPU useage up to 100% and thus increase temps...It will not damage your computer...Your computer is built to withstand this kind of useage...Unfortunately too many computers sit idle all day...Investigate SETI...and the BOINC system it is a part of...It's a gateway to using your computer for a variety of distributive computing projects.
It can be confusing for a beginner...But there are resources on the project site to help you get started.