Win 7 comes with recovery function to build a system restore disk

Creating a System Restore CD takes only 3 steps:
1. Click on Windows, select “Start”>Control Panel>System & Security>Backup & Restore

Select “Create System Recovery disk”.
2. If there are multiple optional hard disks in the system, select CD or DVD from the drop-down menu to burn. Insert the CD or DVD into the drive and click “Create Disk”.

3. After completing the above steps, you will see the system creation process bar. It takes only a few minutes for the Windows 7 system to create a recovery disc. Finish clicking <;OK”

Prepare the Windows 7 system for a rainy day, in case you need it later