Change the default operating system for startup

If you have more than one operating system installed on your computer then you may choose which one to start when you turn on or when you restart your computer. Perform the following steps to change the default operating system for startup:
1. Click the Start button . Right-click Computer and then click Properties.
2. From the left pance, click Advanced system settings (If you are prompted for an administrator password or confirmation, type the password or provide confirmation).
3. Click on the Advanced tab.
4. Under Startup and Recovery, click Settings...
5. Under System startup, in the Default operating system list, click the operating system that you want to use when you turn on or restart your computer.
6. Click OK to close Startup and Recovery dialog box.
7. Click Apply and then click Close to dismiss the System Properties dialog box.