Restart computer and look on first BIOS screen for the F-Key to tap to Enter BIOS Setup - normally ESC, F1 or F2.
Enter BIOS and look for Boot Order setting: Set DVD drive to boot first, followed by HD.
Save settings and reboot. Place DVD in drive.
Now look for prompt to "Hit any key to boot from CD/DVD drive" and do so.
Choose keyboard/language, then agree to "COnnect to Internet during Installation" to receive latest updates/
drivers during install (plug ethernet cable first), the Custom install, use Advanced drive tools to wipe and format entire drive.
When Windows 7 starts up connect to internet to activate and receive newer
drivers via Windows Updates. If
drivers are missing in Device Manager, locate them on your manufacturer's Support Downloads page along with apps you desire. Adobe flash/reader and Java runtime/Free Ofc suite can be gotten from their site.