MS Office 2013. I just started having the same problem this morning as well. I did the repair online and that seemed to fix most things. At least until I tried to open an excel spreadsheet, then the same thing happened again. So tried each Office application individually, Word worked, Outlook worked, Powerpoint worked for slideshows but not for ppt files. Excel would open if I clicked on the .exe itself but wouldn't open any xls or xlxs files. Excel told me that it wasn't the default app and said go to settings default apps to fix. So, I did that and set excel as the default app for all of the appropriate extensions. The default app had been set to APPVLP, whatever that is. I don't know what APPVLP is but it seems to be the root of this problem. How do we get rid of this appvlp?