By boot disk you mean recovery disk? If your drive is corrupt and you can't boot off the restore partition you have a few options. Contact the manufacturer for a set of disks or a new drive if the system is in warranty. Get an OEM Windows 7 disk and use the code on the computer (this may or may not work depending on the disk, some are tied to a range of keys). Get a new Win 7 disk and a new code. OEM versions are a bit over $100.