My advice to you is DON'T USE THEM for the following reason:
Quote: Originally Posted by
xMichael 
I've installed two programs just to check how many errors they'll detect. There were over 10000 errors! I decided not to remove them because I was a bit afraid of not being able to start windows the next day...
I've only installed the Windows couple of days ago
Since you only installed Vista a couple of days ago it is extremely unlikely that you will have a dozen or so errors in the registry, let alone the 10,000+ that were being claimed. Any superfluous entries in the registry are simply ignored.
Dwarf