CCleaner and Windows 7 (build 7000)

Hello all,
I use Windows 7 (public Beta) like principal OS, so much of its stability and its speed makes it more pleasant to use than my Vista in dual boot. But the more I use it, the more I feel a light heaviness in the system (I installed only Photoshop, the continuation of Office 2007 and the Live continuation). The menu to start is not posted in an instantaneous way, etc, I would like to use CCleaner to cure that but I fear that it does not misfire certain thing if it were not to optimize for.
Would some among you have already to use this Ccleaner on your system? Thank you

I have heard of ccleaner deleting some important files that shouldn't be included in the deletion list in windows 7. Best to check to make sure something included isn't important before running cleaner programs.

I think ccleaner nerfed my installation so had to reinstall windows 7 last night. So I am going to hold off recommending it until windows 7 is fully released and ccleaner states it supports windows 7.

When I run it in a Virtual PC, it works. The only thing that I noticed is that the recycle bin options don't show up (the right click options). But my experience has been that it works.