More Vista Problems

First post on this site so hello..

anyway my acer aspire 5100 laptop is having a few problems with vista, firstly the DEP was closing quite a few legitimate programes, so i disabled that via the command prompt. the inbuilt camera wont work now tho and neither will msn messenger, i can click the shortcut and even try to run as admin but it wont load up.. :@, however both load up in safe mode. the most serious problem however is when i try to shut down or log off, the blue loging off screen stays on until l i turn the computer off manually.

aswell as disabling DEP altogether i ran some paches to get msn working on its own.. im now wondering if that is whats caused the problems.

cheers in advance