Turn on the classic windows interface so it looks like win98 in vista. Doing this disables aero and reverts vista back to the standard 2d accelerated desktop (as opposed to the 3d accelerated desktop which eats ****ing memory).
Another good thing to do is to right click on computer, go to properties. You'll end up at the system properties window, you need to look to the left in the window and click "advanced system settings". Once in there, go to the advanced tab and click the performance button. You'll see a little radio button that says "optimize windows for best performance" (that gets rid of all of the vista eye candy); click that radio button.
The next thing you look for in this window, is setting up vista's virtual memory. For virtual memory set it up to static and not dynamic, and the size of the page file should be how many megabytes of ram you have. So, 4gb of ram, then a 4gb page file.
Feel free to click ok. You'll see vista become very resource friendly. This is all i ever do to vista. Idk if i had a vista friendly computer, but it was core 2 duo with 2gb of ram. It's a great OS. But, people got to complain because it's not xp. Not to mention people not realizing just how awesome UAC is (it's akin to sudo in ubuntu). I think the only areas people should complain about vista are the hardware requirements and possible incompatibility with older xp software, other than that, it was way better than xp was. Aside from that, vista has a start menu similar to xp's default, and then the taskbar is black (oh no, it's so unlike xp, i'm going to **** myself). After that all of the advanced tools you'd find in xp were upgraded in vista and worked better.