What system are you using?
Bootsect re-writes the bootsector of the disk (Ok if the bootsector is damaged)
You use BcdEdit to edit the current boot manger.
Bootrec to fix a master boot record (MBR), a boot sector or a Boot Configuration Data (BCD) store.
You can use bcdboot to create a new boot manager in windows 7 and assign it to a windows system folder (usually c:windows) to make a system bootable.
We usually only use that for deploying imaged systems with WIM files using imagex or native boot VHD'd but its very handy if you need to wipe out a
boot manager and create a new one because the old one is to damaged to be repaired.
All in all its quite rare that sharp trauma to a hard drive that causes a system to stop working can be fixed with just a few system configuration
repairs. A lot of the time the knock will have damaged the surface of the hard drive beyond repair.
Best advice i can give is dont break your toys when you get mad...
edit on 23-1-2013 by PhoenixOD because: (no reason given)