I am using a dual boot system with Ubuntu 13.10 and windows8. I have a 64 bit hp pavilion g6 but when I last installed my win8 I installed a 32 bit OS, and then I installed my ubuntu over my win8. Now my workload on the win8 workspace has slowly increased and the 32 bit os operation is becoming a problem, plus the hardware reserved RAM for the 32 bit OS renders most of my RAM unusable. So I want to format only my windows partition and reinstall a 64 bit OS over there. Is it possible? If yes, how do I do it??