Reformat the drive, or if you cannot do that delete the partition, recreate the partition, then format it.
Sometimes there maybe a bootstrap file you can edit. I think under windows OS it's called boot.ini
try this link for some examples of editing the boot.ini
http://support.microsoft.com/kb/289022
Sample Boot.ini File
This is a sample of a default Boot.ini file from a Windows XP Professional computer.
[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(1)WINDOWS
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)WINDOWS="Microsoft Windows XP Professional" /fastdetect
This is a sample of the above Boot.ini file with a previous installation of Windows 2000 on a separate partition.
[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(1)WINDOWS
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)WINDOWS="Windows XP Professional" /fastdetect
multi(0)disk(0)rdisk(0)partition(2)WINNT="Windows 2000 Professional" /fastdetect
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