As the topic says I'm pretty sure that I want to replace my windows 7 with ubuntu but I need to know if I can upgrade my OS to 64bit from 32bit windows 7.



When you want to replace Windows with Ubuntu, it does not matter which version you install.
Important is that your PC has a CPU which supports 64-bit, what most probably will be the case.
So yes, most probably you can install the recommended Ubuntu 64-bit edition on your computer.

Note : You cannot upgrade the operating system from Windows to Ubuntu, you have to install it.
Download Ubuntu Desktop 64-bit and install it by following the Ubuntu installation instructions.

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