Windows 7
Insert the Windows 7 installation CD in the CD-ROM drive and restart the PC.
When you see the message *Press any key to boot from CD* press a key on the computer keyboard.
Press the Enter key at the Windows Setup welcome screen.
When prompted, press any key on your keyboard.
On the *Install Windows* page, pick your preferred language and additional preferences,after that click Next.
On the License Agreement page, accept the terms and agreements and click Next.
On the Installation Type screen, select the Custom option.
Choose the Drive Options *advanced* option.
For Disk 0, delete all partitions. When all partitions have been erased, you should notice a single entry known as *Unallocated space*.
Click on Disk 0 and choose Next.
The Windows installation procedure will begin by creating a new partition, formatting the partition, and installing Windows on the hard drive. The formatting procedure will erase the hard drive just before installing Windows. 