Use Run command and type "msconfig," and hit the enter key.
You see "System configuration utility" window there. Click on the "Startup." tab
Uncheck the boxes for the stuff that you know you won't be using as often. Be sure not to uncheck the system boxes
Uncheck things like Messenger and LimeWire and those kinds of software that you don’t use regularly.
Hit the "apply" and restart your computer and you'll see optimized pc.