I want to remove Elementary OS and want to get back to Windows but to install Windows i need to identity if 32-bit architecture or 64-bit architecture and whet I open details about my current system - there is no details about it. How to find it out?

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Elementary is 64 bit only and has been for a while. However, you can check your CPU's abilities with:

sudo lshw -class processor

That will give you a bunch of information about your CPU. You can look specifically for:

width: 64 bits

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