The first that you have to do when you are trying to fix a slow computer is do the cleanup. All you have to do is go to My Computer and go to C drive from there. Go to properties and clock on the button that reads disk cleanup. After that, you have to get a spyware scan run. Computers can become very slow if they are virus infected.
Therefore, a scanning is a must. Corrupt registry is one of the major causes of computers being slow. You should get a new registry created when you get a program installed or uninstalled. You have to remember that the job is hardly completed by the uninstall programs which are available with different software. Files are generally left behind and this makes the registry bloated after a certain point of time. The files may also be corrupted by blue screens, power losses and shutdowns made in the wrong manner.