Ouch, sorry to hear that, your os is corrupt, could be one of many reasons including a virus, or just a corrupt HD. Get the OS disk that came with your computer and reboot, make sure to boot the DVD/CD not the HD, start the install process, you will eventually get to point where you can select to do a repair, choose that and see if it will recover, if it does you shouldnt lose anythig, but you will need to reload some drivers and an update.
Also read through the info in this
link.
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