you have to reinstall everything as it is a different architecture of Windows. Your programs should work in a 64bit environment as well (there may be exceptions).
Why would you want to change anyway? Cause you have a 64bit processor??
You'll have to do a clean install of 64 bit Windows 10. There is no way to convert it over. If your new machine has more than 4gb of ram, you will need a 64 bit OS to take advantage of all the ram.
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