PSZ

I just tried Defraggler (1.01.064) for the first time, and so far I like it, but... It doesn't access volumes that are mounted to a mount point but have no drive letter allocated (XP/Vista). They don't even show up as folders in the analysis of the "host" drive.

You're not alone I have installed Vista (RTM) on a test system, and CCleaner refuses to run other than as admin. Because of this I cannot use it to cleanup my "ordinary" account ? unless I disable UAC altogether, which is unwise security-wise