Windows will not boot up. Please Help

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Yesterday i get home from work and my gf tried to reinstall our router software using our windows install cd. Needless to say she doesnt know what she did now everytime i turn it on it goes straight to a black screen, no boot menu or anything. It is an hp pavillion notebook running windows vista. I have reformatted and reinstalled windows a dozen times on different pc's but this isnt giving me a boot menu or any way into bios. Boots up to blank black screen, any key i hit results in a / running down the entire screen.

Please help any suggestions would be greatly appreciated.

Thank you,
Sevens
 
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