It is important to keep your hard drive clean and tidy. You should run the Disk Cleanup and Disk Defragmenter on a regular basis which will ensure that you are getting the best performance from your hard disk.

Hard drives start to become inefficient once they are more than 65% full and access times to data begin to slow down. If you have an 80GB hard drive you should not store more that 52GB on it or if you have a 250GB hard drive you should not store more than 163GB.

Temporary internet cache can take up enormous amounts of space on your hard disk, it is worth reviewing your browser settings to see how much space is allocated and how many days cached internet pages are kept for.

Refer to your system help files for more information on these topics