Disk Space Issues
In order to install and run, System Restore requires at least 200 MB of available space on your hard disk (or on the partition where your operating system folder is located). If you do not have sufficient space available when the operating system is installed, System Restore is installed, but it is not activated. System Restore cannot be turned on until you make at least 200 MB of disk space available.
When System Restore runs low on disk space, the monitoring of all drives is suspended. All drives are displayed as suspended in System Restore Status in Systems Properties in Control Panel. When System Restore is suspended, you cannot run the System Restore Wizard. If you attempt to run the wizard, a dialog box is displayed to inform you that System Restore is suspended. System Restore automatically resumes monitoring when a minimum of 200 MB of disk space become available.
To make more disk space available, do one of the following: