|1: Put your W7 Cd in the drive & reboot.|
2: All going well you will see a message for about 4 seconds, saying > Press any key, do so.
3: You now want to do a new install ( not Repair ) so you need to delete all partitions & format to NTFS.
4: W7 will now install.
5: During the install, you will get reboots & see the message > Press any key > Don't.
How to Do a Clean Installation with Windows 7