Hello,
Do not press on F8. What you need to do is to do a start up repair. Select the option to repair the operating system. Then it will load some files. JUst wait for it to complete the loading process or the repair. It will tell if the repair is successful or not. If it doesn't fix the problem, then, you need to install the operating system to your computer. But, remember that operating system re-installation will return your computer to scratch. It will erase everything including the files and programs that you have added in your computer. But, if you don't have anything to lose then do the operating system reisntallation.
Here's a guide on how to reinstall windows vista:
http://www.blackviper.com/Articles/OS/InstallVista/installvista1.htm
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