Windows 7 won't load anymore?

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http://askubuntu.com – i had ubuntu 11.10 and windows 7 working perfect. 5 days ago upgrade to 12.04 lts. I leave it running and went to sleep. Next day a try to load it but the mouse on the laptop didn't work. so i kept using previous version. today i was doing some changes in backgrounds and updates. when i restart the computer a "debian. the universal operating system" screen appear where you choose windows 7 a ubuntu 12.04 and previous linux. when i pick 7 it said disk read error ocurred press ctrl+alt+del. could someone help me please. i don't know jack crap about computer but love ubuntu and 7 for netflix and (HowTos)