There are few other programs that can send you into a blood thirsty screaming rage like Microsoft Office. Often the problem is a user problem, but not always.
If you get an error when opening a file something like:
PowerPoint found an error that it can’t correct. blah blah blah
The problem could be that the file is blocked. To solve that, simply right-click on the file you’re trying to open, click Properties, then click the “Unblock” button. Open it again and all should be good. If not, then you have another problem and should continue your search. This is only 1 solution for 1 potential cause to that problem.