Most of the time, when I am working in fixing boot records, I grab the Windows XP bootable cd, boot from it, Press "R" to repair the installation, then at the command prompt run FIXBOOT then FIXMBR. Then EXIT to reboot.
Here is an explaination of what these commands do:
FIXBOOT writes a new boot sector onto the system partition. The syntax for the command is:
FIXBOOT [drive:]
If you do not specify the drive: option, FIXBOOT writes the boot sector to the default boot partition. You can specify a different drive if you need to write a boot sector to a
volume other than the default boot partition.
The FIXMBR command lets you repair a master boot record (MBR). The syntax for this command is:
FIXMBR [DeviceName]
If you omit the DeviceName parameter, FIXMBR rewrites the MBR on the boot device. You can specify a device name to write a MBR to a different drive (such as a floppy disk or secondary hard disk). You can use the MAP command to retrieve a list of device names. An example of a valid device name is \Device\HardDisk0.
