If you have had your computer a long time and have never run disk cleanup or disk defragmenter, you have already experienced some pretty heavy issues with your programs and your computing is probably slow.  That is unless your computer has crashed and you are not using it at all.  You can avoid these issues by running disk defragmenter ever two weeks.  Here’s how to defrag your computer.  Click on Start, go to Program Files, click on Accessories, go to System Tools and click on Disk Defragmenter to start the program.  Once you open the program, click Disk Defragment and let it run.  This process can take a few minutes to hours depending on how long it has been since you ran the program.