I've only heard of #'s 3 and 7 on your list. There's no problem with leaving them installed - the problem (IMO) is with using them to automatically clean the registry.
Personally, all I think that you need are these 3:
EDIT: Oh and FWIW, I don't clean my registry all that often, nor do I use the tools very often. I keep them on hand "just in case". When I used the http://safety.live.com
scan yesterday, it was the first time that I can remember doing anything to my registry in a very, very long time (6 months to a year). And it only found about 800 errors (not many considering that my registry consists of about 500,000 entries or more.
I routinely install/uninstall programs for testing purposes. I surf to bad places on the web trying to ferret out problems. I manually edit my registry whenever I feel the need to (luckily, I have ERUNT automatically backing it up!) And I don't perform all that much maintenance. So, with only 800 non-threatening entries to deal with I was confident that the Microsoft tool could fix it. The use of the NTREGOPT tool can speed up registry access by compacting your registry - but I haven't noticed any difference with it in the past.
Edited by usasma, 25 September 2006 - 08:47 AM.
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