If the idea of a 32 bit vs a 64 bit windows 7 operating system is coming to your mind, and you’re thinking of upgrading it, you can follow this particular step by step tutorial.
To upgrade from 32bit to 64 bit in windows 7, you need the required hardware such as a 64bit processor etc. Furthermore, upgrading your windows from 32 bit to 64 bit will wipe out all your data and the applications. So, it is recommended that you backup all your data before you proceed.