I use all of System Mechanic 6's
functions; my sustem is purring and I had NEVER had any problems!
Ever.....!

So..why not take your chances. I won't say that System Mechanic 6 is
the best because I might be biased. Check the reviews for PC-cillin,
System Mechanic, Norton System Works, et al...and try a free download
before you buy.
Happy New Year,
PS: Those that say don't? I wonder!