Looking over your DXDiag logs, your computer looks as though it should be able to handle the editor without any trouble. UE-29612 is related to the build error you were receiving. It has been fixed and you should not run into this build failure in 4.12.
Moving your assets/files over to a new project seems to be the best way to resolve the issue if deleting your intermediate, config and saved files do not help.
Thanks!