Dear Friend,
Tip:
Purchase genuine Microsoft Windows 7.
To boot Microsoft Windows 7 from a DVD, you need to follow these-
1. Insert the Bootable DVD ROM in the drive.
2. Restart your computer.
3. When the logo of your Motherboard Manufacturer displays on the screen, frequently press F2 or Delete button of your key-board.
4. You will enter into BIOS Settings.
5. Search and set-up the following conditions there:
First Boot Device : DVD ROM
Second Boot Device : Hard Disk Drive
6. Save your settings and exit to restart the system, and boot your system from the DVD.
I hope if you purchase a genuine copy of Microsoft Windows 7 from Microsoft at: www.microsoft.com