What is that other OS?
Who installed Windows Vista?
Why it matters is that Windows is not easy to install yet. You find that you still must find and install drivers just like we did 20 years ago.
Bob
I run Windows Vista Premium. Within the past day my computer has not been able to run windows properly. It starts up promptly as usual and loads all the necessary programs. However when I try to click on something to open it, Windows will lag and the window will finally pop up after about 10 seconds of thinking. Then if I proceed to click on anything within the window it will completely freeze and say (Not Responding). When I try to pull up the Start menu the menu takes forever and will not respond most of the time and will not allow me to restart properly. When I try to pull up the task manager the computer will think about it for almost a full five minutes and when it finally pulls up it will take about 10 seconds to decide before it actually responds to any action I may ask it to take. I have 4GB of memory and an Intel Core 2 Core 2 Duo 2.53 GHz. It is an ASUS and fortunately it has this built in second OS provided by ASUS. This second OS works completely fine and has absolutely no problem running multiple applications without any slow down of any kind, it only happens on windows. I did a disk clean up, defragged and scanned my computer with my Kaspersky Anti-Virus and found nothing. I've updated everything I can think of and tried closing certain programs but still I am stuck!

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic