Community AdminSure. you can adjust the install location in Origin by clicking Origin in the top left, then Application Settings>advanced.
To move the already-installed game location is a little awkward, but handy enough. It's worth making a backup, just in case.
Back things up and change the folder name. Uninstall through programs and features. Create an Origin Games folder in your new install location, then change Origin to install there, as mentioned above. Copy in the game files, and change the name back. Then restart Origin. Start "downloading" and it should scan the files there and start installing.
