BOOTCAMP Suddenly not working after a year...Please help

I am not sure if this is the right place to post this but I need help with the BOOTCAMP hard drive on my mac. I had this macbook for over a year now and when I first got it I installed the BOOTCAMP hardrive and since it has been working fine. I know that when you turn on the laptop you press the option button and both show up. HOWEVER for some reason today, out of the blue, it won't work. When I press the option button nothing shows up and the screen stays grey. I then have no choice to just turn it off and turn it back on again. I can't get into the bootcamp harddrive.
At first, it showed up and then went black. And my computer was low on batter and shut off. in the middle of processing it. When that happened something popped up and over a black screen and I couldn't read it cuz the computer shut down fast. And since the harddrive doesn't show up anymore...
Does anyone know why this happened and how I can fix this? Please help me

If you can get the Windows install disk the first thing would be to see if it will boot the computer and then run the repair utility. If not then a reinstall is probably necessary.
For furture reference it is prudent to back up a BootCamp partition so that a complete reinstall is not necessary and your data is protected. For information via a recent thread read this:
http://discussions.apple.com/thread.jspa?messageID=12280024&#12280024
You can't have too many backups of any drive.

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panic(cpu 0 caller 0xffffff802a005eb2): "Possible memory corruption: pmap_pv_remove(0xffffff803b8db998,0x7fff7360f000,0x6d654, 0x6d654d64, 0xffffff8031663cc4, 0xfffffeb38ae0f078): null pv_list!"@/SourceCache/xnu/xnu-2782.1.97/osfmk/i386/pmap_internal.h:768
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0xffffff8031663cf0 : 0xffffff802a0065e5
0xffffff8031663d50 : 0xffffff8029fb6b4a
0xffffff8031663e60 : 0xffffff8029facd2c
0xffffff8031663e90 : 0xffffff8029f5c747
0xffffff8031663ed0 : 0xffffff802a3c45ff
0xffffff8031663f40 : 0xffffff802a3c425c
0xffffff8031663f50 : 0xffffff802a44dcb2
0xffffff8031663fb0 : 0xffffff802a03ac46
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com.apple.driver.AppleMikeyHIDDriver    124
com.apple.driver.AppleHDA    266.5
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[email protected]

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I have exhausted all of the solutions I have been able to find on this forum: telling my mac to open .xmp files with Bridge, telling Bridge to always use high quality thumbnails with 100% preview.
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