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If you are prompted to select the operating system to start, just press ENTER.
When you are at the command prompt (dos screen) type "rstrui.exe", and then press ENTER (dont type the quotation marks).
Note: this command may or may not work depending what directory folder you are in at the dos prompt. For example if you are in folder C:\documents and settings\administrator the command will now work. You will need to change the directory of the C prompt. To do this type "CD C:\Windows\System32" (again type only what is in between the quotes then press enter). Then type in "rstrui.exe"
Now that you have the restore screen restore your computer to a time when you know the computer was working properly.
If you use System Restore when the computer is in safe mode, you can't undo the restore operation.