If your computer slows down, you can get it back to speed by following a few maintenance steps that won't cost you a pretty penny.
Check your hard drives. Make sure that you have at least 20 to 30 percent of your disk free at all times. If you can, perform a defragment if Disk Defragmenter deems it necessary. To do so, navigate to the "Start" menu and select "Computer." Right-click the local disk volume that you want to defragment, and then click "Properties." From the "Tools" tab, click "Defragment Now."
Make sure that you have a virus checker and spyware deletion program on your computer at all times. Viruses will really slow down your PC and spyware can have the same effect on either your computer or Internet. If your Internet suddenly becomes very slow or full of pop-ups, chances are you have been infected with either a virus or spyware. Spyware deletion programs are available for free online. Download and install a spyware deletion program, such as Lavasoft's AdAware (lavasoft.com), SpywareBlaster (javacoolsoftware.com) or Spybot (safer-networking.org/en/home/index.html). These programs are free. Don't pay a fee for one, because these tend to be scams.
Delete any cookies or saved Web pages that have been loaded onto your computer. This is easily done by clicking the "Tools" tab in your browser and selecting "Internet Options." Underneath Browsing History, there should be a "Delete" button. Make sure you check the box that states "Delete all offline content." This deletes saved pages and cookies from your PC.