The Volume Boot Sector (Partition Boot Sector aka PBR) is the first sector of a partition. If the partition is boot-able, it stores an executable program to load an operating system.
Hopefully, you created an emergency repair disk for your Windows OS. If not, try creating a Windows bootable floppy on a friend's PC running the same OS. An old DOS startup disk with installable device drivers for the CD-ROM might work too.
The floppy will also need to contain DOS system executables (FORMAT, CHKDISK and so on). The command you will need to use is FDISK.
Once you boot up with the floppy, type in the command FDISK. The FDISK Options menu should appear with 4 options:
1. Create DOS partition or Logical DOS Drive
2. Set active partition
3. Delete partition or Logical DOS Drive
4. Display partition information
Select #4 to verify which partition Windows is on. Then go back to the menu and select #2, and make your Windows partition the "active" partition. This solution may allow you to recover without losing all your Windows data. Otherwise, you will have to start from scratch and reformat your hdd.
I tried dual-boot set ups in the past and found they were more trouble than its worth! If you must have a dual boot setup, forget partitioning and just install a second hard drive! Trust me, you will breathe easier. On the other hand... you can just quit Win-blows all together and join the super suave and elite Linux crowd