Need more info. you need to post specs, such as CPu, memory, hard drive, PSU, and whether you have system problems, if so what ( slow boot, programmes slow etc).
You disabled UAC, which gives you less control over wat happens. Things can install and you wont even know it. As for a pain, I find many problems are meatware probs. My Vista works fine, As far a sopening consoles, if you leave UAC on, you can continue the op, if you turm it off, yo ulose it. Would suggest you right click on it and choose run as admin.