|It could be sector one corrupted, but then it could be many other things as well.|
Sector 1 is where the Master Boot Record is stored and that is loaded in the first stage of booting the Operating System. If the MBR cannot be read nothing happens.
You don't say which version of Windows you are using but assuming that you are using Windows XP boot from your Windows XP CD and select the first Repair option. This will put you into the Repair console for which you may need to enter a password. If you don't know what the password is press enter on the password field, it may be blank.
Once you have the prompt type FixMBR. When that's done re-boot and try again. This will rewrite the MBR and repair an corruption.