No matter what type of computer you have, over time the hard drive will become defragmented.  What is fragmentation? Check out the Youtube video:

Use Windows Built-In Tools to solve this condition and increase performance by following these steps:
1.     Single click "My Computer," right click "C" drive, click properties, click tools
2.     Highlight your system drive, (usually C) then click defragment
3.     While you are there, on the General tab, you have the option to Clean the Hard Drive.
4.     Click disk cleanup and select all items in the window.

This is a simple, yet cost effective built-in method to keep your system running efficiently.

Recently, I have noticed that the Babylon toolbar is rearing its ugly head and being installed on computers and is integrating itself into your favorite browser.  

This program is ad-ware and can wreak havoc on your computer and cause it to slow down to a crawl and become useless. As a result of that, I've done some research and found that the following articles describe how to remove the Babylon Toolbar from your browser of choice:

Babylon Toolbar Removal From Internet Explorer

Babylon Toolbar Removal From FireFox

Babylon Toolbar Removal From Chrome

Hope this helps you as much it helped me!