I just want to uprade my pc's ram from 2gb to 6gb(2gb+4gb).....when i went to nearest pc shop,they said that i need to get 64bit to use 6gb ram....I said ok just do it....they later told me that i need to format my pc in order to get 64bit system because there is not enough space(it has 50gb) in C drive to install 64bit...So is there any other way to install 64bit system without formatting pc..please