I understand Windows NTFS systems keep a duplicate boot sector, so the boot
problem may be correctable. Following instructions are for Windows XP; if your
OS is another version, Google "boot sector repair".

Instructions 1. * Start your computer, holding down the "F8" key during the
boot process. This will open a startup menu. Select the "Recovery Console"
option in the startup menu. This opens the Recovery Console.
* 2
Type the administrator password at the prompt, and then
press "Enter." Your computer will display a Recovery Console command
line with a command prompt.
*
* 3
Type "fixboot" (without the quotation marks) at the command
prompt, and then press the "Enter" key. The Recovery Console will repair the
boot sector, and notify you when the repair is complete. Restart the computer
when the repair finishes.