Hi Beneeta,
Are you using 32-bit or 64-bit Excel/Office? Support for 64-bit Office 2013 didn't start until patch 7, and even then it's still limited. Even if you are using 64-bit Windows, 32-bit Office is generally recommended. See Notes 722513 (Desktop Office Integration: Maintenance Information) and 1442028 (SAP GUI for Windows / Desktop Office Integration: Support for Office 64bit editions).
Either way, patch 5 is quite old for GUI 7.30. Have you tried updating to the latest patch? Also, make sure your Office suite is fully patched from Microsoft, too.
Regards,
Matt