i can second the auslogics disk defrag. it's better and more detailed than the supplied microsoft defragger. also, the auslogics registry defrag comes in handy.
You can use the command prompt and defragg much better within Vista and don't believe all people say about vista i have 4 systems running vista no issues and perfectly stable all running the new SP1 also and it improved some areas of the operation System. Also use the command prompt to do a more advanced disc clean up that will give you back some of the hard drive space that is eaten up by shadow copy. I also use Diskeeper Pro 2008 on all the time plus use the default Admin account so I do not get any UAC pop ups but it is still running in the background and this is been a good operating system for me and I beat tested since day one for MS and have gotten a lot of freebee for my help with there programs.
well UAC is a setting... an annoying one at that... when i first got my laptop from hp, it had it enabled. then i reinstalled from a retail disk and their default setting is to have it disabled... it all depends on what you have it set at, regardless of Admin rights or not...