Have you changed any software on your system lately? The Windows 10 upgrades being foisted on unsuspecting Windows 7 users are causing all sorts of problems. I've just gone through the process of having to wipe two systems and rebuild them from scratch - on one there were no restore points to go back to and on the other none of them went back far enough to undo the damage. On the laptop with no restore points, I couldn't even access the laptop's recovery partition. So then I had to go to a library to download a new 3GB Win 7 iso, find all the necessary drivers, then download all the post-SP1 updates (except for the Win 10 abomination), AV software, install Office 2010, download all the post-SP2 updates, etc., etc., before I could reload all my data... Except for the Win 7 iso download, I had to do basically the same process twice - once for each laptop.

If you haven't had the misfortune to have Win 10 inflicted on you (check your Windows update history), you could try repairing the Office installation (via Start > Windows Control Panel > Programs > Programs & Features > Microsoft Office (version) > Change). Alternatively, since everything works in safe mode, the problem may be due to an errant 3rd-party Office addin. Try Starting Word/ Excel and disabling any non-MS addins they share.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]