Commented Unassigned: Can't Get NodeXL to Import Excel Workbook [25437]

I've asked about this problem before and still haven't seen any resolution. when I try to import Excel workbook, I get error message "There are no other open workbooks", but I do have a workbook open. I also checked Task Manager to ensure that two application of excel were indeed running.

I've had this problem now on two different computers, both running Windows Vista.

Any advice or help please?
Comments: ** Comment from web user: PMcLeod **

Thank you Tony. I followed the steps, - I opened NodeExl, and from that file menu opened by workbook. I checked task manager & saw 3 applications of excel - one named NodEXl and the other two with the name of my spreadsheet.
then when I tried opening the spreadsheet, I still got the same error message.

I feel like I must be doing something very basic, wrong.

Thanks again

-plm