Clean and restart the computer

Restart the computer with a clean boot
Clean startup is the method for creating a clean environment. When you start your computer with a clean boot, Microsoft Windows starts and loads only basic devices and services. For instructions on how to use clean boot and how to use normal startup, see the following " More information " .
1 . Click start, and then click Run.
2 . In the displayed dialog box, type msconfig and click OK.
3 . Click the General tab, and then click Enable.
4 . Click to clear the following check boxes: ? Process the system. ini file
? Process the win. ini file
? Load startup Item
 
5 . Click " Service tab.
6 . Click to select the hide all Microsoft services check box, and then click Disable all.
7 . OK, restart the computer in turn.

Reposted from msdn