Choose Start→Control Panel→System and Security. Click the System link.
You can also get to the System page by typing “System” in the Start menu’s Search box and selecting System from the results list.
Click the System Protection link in the left panel.
In the System Properties dialog box that appears, click the System Protection tab and then click the Create button.
The Create a Restore Point dialog box appears.
Name the restore point, and click Create.
Choose a name that you’ll be able to recognize again, such as the current date or the name of a program you’re about to install.
Windows alerts you when the restore point is created. Click Close until each of the boxes is closed.