Hello,
The full error message is
Sorry, we can't perform this action. Incompatible Office products are installed on your machine. If you have an administrator, please contact them for help.
I have already tried uninstalling the kb2920798 update and restarted with no luck. Then I uninstalled Office 2013 and then re-installed it and it didn't work. It seems as though it is a problem with onedrive possibly, but doing the Office 2013 install gave it a fresh install, so I'm not sure. I can download and open them, but only from sharepoint the issue is happening. Please help