Nitro Pro 7 conversion error

I have been using two PDF readers simultaneously, Adobe Reader and Nitro Pro 7.

Yesterday while using Nitro Pro 7 to convert an XLS file to PDF, I was met with a n error.

It was working perfectly before but now when I try to convert an xls file into PDF using Nitro, it says that it is already a PDF file and not an Xls file so it cannot be converted. I get the following error message:

Nitro Pro

There was a problem converting one of your source files

(C:UsersjbbakerAppDataLocalTemp4025-xxxxx-xxx-Rev#

Compliance Matrix.Pdf) to PDF. Nitro pro is unable to combine

the selected files.

                                                              OK

I also tried to convert Doc files to Pdf using Nitro, and it is working fine but not with the xls file. Why is that so? Recently I updated the adobe reader 10.1.3 so I thought that might be causing a problem so I uninstalled it and also reinstalled the Nitro PDF reader. Again the same error occurred.

Can anyone explain where am I making a mistake? Why is Nitro Pro 7 nut working properly?

Your suggestions are required to resolve the problem.

Regards

Bill