1. Boot your computer from the Windows 7 Intallation Disc
2.Press any key when prompted, and then follow the instructions that appear.
3.On the Install Windows page, enter your language and other preferences, and then click Next.
4.On the Please read the license terms page, if you accept the license terms, click I accept the license terms, and then click Next.
5.On the Which type of installation do you want? page, click Custom.
6.On the Where do you want to install Windows? page, click Drive options (advanced).
7.Click the partition that you want to change, click the formatting option you want to perform, and then follow the instructions.
8.When you've finished formatting, click Next.
9.Follow the instructions to finish installing Windows 7, which include naming your computer and setting up an initial user account.