How much free space do you have left on the C drive? I'm imagining it's pretty close to none by now, but that of course depends on other factors as well. Windows (and the games) really need at least 40-45 GB of free space to maneuver properly.
I don't have an Origin install myself anymore having moved over to Steam, but am am pretty sure there is a way to get Origin to shift the game/pack program installs to a different drive. Such as that discussed here, but a Google search might reveal more info (or the same info repeated many times).
https://answers.ea.com/t5/Technical-Issues/Origin-Moving-Games-to-Another-Hard-Drive-or-System/td-p/5776562
Instructing Windows to redirect the entire user Documents folder should be easy, although I would suggest copying or moving out the game folders and any important documents stored there first just to make sure nothing gets lost in the process.
http://www.dummies.com/computers/operating-systems/windows-10/how-to-change-the-location-of-user-folders-in-windows-10
