Steps to perform a clean boot:
a. Click the Start orb on your Desktop
b. Type msconfig in the Start Search box, and then press ENTER.
If you are prompted for an administrator password or for a confirmation, type the password, or click Continue.
c. On the General tab, click Selective Startup.
d. Under Selective Startup, click to clear the Load Startup Items check box.
e. Click the Services tab, click to select the Hide All Microsoft Services check box, and then click Disable All.
f. Click OK.
g. When you are prompted, click Restart.
NOTE: Please ensure to start your computer in normal mode once you have finished troubleshooting. FollowStep 7 from the KB article mentioned above.