Two nifty must have utilities for Windows Vista is TweakUAC that allows you to toggle the User Access Control so you can install software without having to turn it off completely. Then there's Unlocker, that allows you to remove folders that Windows insists on denying you permission to remove it even if you have given yourself full administrative rights to do just that. Both cool and free too.
"Show me just what Mohammed brought that was new, and there you will find things only evil and inhuman, such as his command to spread by the sword the faith he preached." - Manuel II Palelologus
Both of those tools are new to me. Thanks!