Thanx for the tips. MSE scanned last night with no malware detected, but I will scan with Malewarebyte today as well.

As for repairing Excel, I am lost. In 2013 I don't see a help menu (maybe I'm looking at it and not seeing it). There is a "?" in upper right that leads to online help, but clicking the FILE tab as in previous versions does not show any help options - in fact it took a while to find ABOUT, it's under ACCOUNT.

Also, when I look in Control Panel PROGRAMS there are no Office 2013 programs there (2010 programs are there). Obviously somethings have changes. Any ideas?
Thanx.

While Excel 2013 continues to lockup if I click on a shortcut to an xlsx file or the file itself (only way to close Excel after that is to log out and back in, Task Manager won't even close it), I find that if I open Excel in a window, then drag & drop the file or shortcut into that window, it opens the file fine. Does this shed any light on it to you gurus out there?

BTW, I have done complete (and LONG) MSE and Malewarebyte scans and found no malware. All other Office Pro 2013 apps seem to be fine. I know I will eventually uninstall everything and start over, but right now I need access to some files and can't risk being several days withput them.

Thanx.

It's good that you have done your scans hopefully you have conducted a malwarebytes scan with the most updated database while computer is in safe mode. Just to be sure.