Reinstall with the 64bit OS.I have 6gb RAM installed on my motherboard, but my OS shows that i have 4gb of RAM installed and its usable 3.19gb. My motherboard supports up to 8gb of RAM.
How to remove the RAM limit?
That absolutely will not work.If your worried about a wipe...create a separate partition and copy just your user stuff (docs, downloads, desktop...maybe) or you could try to copy the current "Program Files" folder to "Program Files (x86)" ...but I doubt it'll work without a lot of hassle.
Best bet is to try installing Windows 10 x64 over Windows 10 x32 if it lets you, it usually backs up your data and I think it may even recognize the 32 bit apps needing to be moved for 64 bit.