I just installed Office 2013 (monthly subscription) and never got the option to upgrade my Office 2010 Professional install. However, I downloaded and installed 2013 and then uninstalled 2010. Now my Excel files, saved to different directories on my hard drive or elsewhere, will not open when I click on them.

If I click on an Excel 2010 or older files, Excel 2013 opens with just a grey background, no spreadsheet gridlines etc. (which by the way is how it opens even when not selecting a file - just gray and blank).

If I first open Excel 2013, then choose the file within Excel under browse, it opens the file I selected fine.

Any idea how I can correct his issue so when I click on an Excel file it just opens without going thru opening Excel first then browsing to the file?

Thanks in advance.
Steve