First, system tools aren't that great at doing this, I find a compauter that has SystemWorks, Mcafee suites and the like to be INCREDIBLY SLOW.

Also ignore those finally fast dot com commercials, totally bogus.

If you want a fast computer most of the tools you need are built in, get a good AV scanner like Fprot or NOD32, both very effective, small, and very fast, they don't bog you down in work.

You can use built-in tools for the disk checks, there is little to no benefit of any of the mass produced defrag software, in fact they defrag too often IMO degrading the life of the HD systems.

The best system is one that is not destroyed by multiple useless software installs, tampered with by registry 'cleaners' and taken care of manually by the owner, or on a schedule by different applications that are best of class for their purpose and not part of bundle of sub par junk.