For Windows 7
1st.
Click the "Start Up" then Right Click "My Computer" then choose "Properties"
2nd.
Click the "Advanced System Settings" then System Properties will be pop up, choose "Advance" then click "Settings" from Performance then next choose "Adjust for Best Performance" from Visual Effects
Click Apply and OK, That's it very simple.
For Windows XP
1st.
Click the "Start" then right click "My Computer" then choose "Properties"
2nd.
System Properties will be pop up, choose "Advance" then click "Settings" from Performance then next choose "Adjust for Best Performance" from Visual Effects
Click Apply and OK, That's it very simple.
But as what I said if it is not working I will you more tips like:
- Try to install CCleaner Free to delete the browsing data, files on the trash folder etc.
or
- Try to read this article from microsoft that related to this topic here.



