Download video: How to Upgrade Windows 10 from 32 bit to 64 bit
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In doing this, keep in mind that if you have less than 4GB of RAM, this won't really be helpful to you. As well, be sure to check for 65-bit drivers for your various PC components to be sure they will work if you do this.
Link to 64-bit ISO: https://www.microsoft.com/en-us/software-download/windows10