n time and then stores each of these snapshots so that you can roll back any changes to a period before you experienced problems.

As you can imagine, these snapshots of your whole system take up memory space. You can delete older snapshots that you're sure you won't need in order to clean up your hard disk.

To delete System Restore snapshots except for the most recent one:

1.      Click Start, point to All Programs, point to Accessories, point to System Tools, and then click Disk Cleanup.

2.      Wait while Disk Cleanup calculates free disk space.

3.      Click the More Options tab, and then, in the System Restore area, click Clean up….