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#11
You'll need to boot the disk, Easiest is to reboot and tap the key given on first screen for Boot Menu, likely ESC on Compaq. Then figure out which is the DVD drive listing and use the up or down arrows to select it, press Enter.
If that doesn't work then try How to Boot A Computer from CD or DVD - YouTube.
Other steps for Overcoming Windows 7 Installation Failures - Windows 7 Help Forums.
Please mark your thread Unsolved at top.