Have you tried safe mode and system restore?
I have had four Evesham machines but I have never had to re-install the disk you have is a full copy of the OS so you could re-install over your present installation.
If you can't get to your files I would go for this option and then make sure you back up all you need to. If you run into any problems later you can do a fresh install.
If you choose to do a fresh install you will need the driver disks.
If the machine is only 1 year old give Evesham a ring and check with them.