I've read a number of posts & answers on this topic but have not found
anything that will work. When opening an Excel file, for example in Windows
Explorer, the Excel app opens but the file does not. Since this is Excel
2007, there is no "Menu" bar, nor a "Tools" menu to navigate. I've looked in
the Excel Options but the only thing I have found similar to the "Ignore
Other Apps" is "Ignore Other Apps that use DDE". But that box is empty.
I've also tried "excel /unregserver" and then "excel /regserver" but no help
there either.

Any other ideas? Thank you very much in advance.