Something happen to a windows Master Boot Record (MBR) that you’re responsible for? Want a very quick, very easy way to restore it with nothing but your craft, native intelligence and a liveCD?
Boot into your Ubuntu LiveCD on the offending machine. Once Ubuntu starts up, go to System -> Administration -> Software Sources and enable (by checking it off) the Universal repository.
Now, open a terminal session (Applications -> Accessories -> Terminal) and type the following: