Crystal Reports 2011 - excel 2007-2010 export

Hello,

I just upgraded to crystal reports 2011 from crystal reports XI Release 2. I am having an issue exporting to excel 2007-2010 format. When I do an export and then open it in excel, excel gives me an error message that the file is corrupt and if I want to recover the contents. When I try and recover the contents, I am greeted with the error below. I am not sure what to do to fix it and would appreciate any help.

Removed Part: /xl/sharedStrings.xml part with XML error. (Strings) Illegal xml character. Line 3, column 19160.

Removed Records: Cell information from /xl/worksheets/Sheet1.xml part