Erik will likely have had a number of different settings from you, which may mean the game doesn't function properly.
Similarly, if you sync and try running the game with mods installed without a profile, you may find it doesn't work.
I typically copy my UserData folder from other installs of rFactor that I use for various leagues. If you don't have any of those, here's what I would suggest.
1) Create a clean install of rFactor or rFactor Lite (I use rF Lite, does the same job).
2) Run rF Config with your preferred graphical settings.
3) Run rFactor with no mods installed and no sync. It will prompt you to create a profile. Do this.
4) Once it's been accepted, leave the game and sync as usual. Reload the game after the sync and it should work fine.