Sage 6.1 PU4 - Excel 2013 32 bit "cmd Start : Error on creating Excel object - Excel not licensed"

Hi

We have a client running 6.1 Sage ERP 300 with SP 4 installed.

They are using Excel 2013 32 bit which PU2 says makes compatible but when we run we get an error saying it cant open excel as excel.

I ran a repair on excel in control panel.

Ran a repair on the Sage install, re ran pu4

Ran regacc

Ran all these as administrator

Checked Addins

Checked Macro Security

Checked my environment variables for multiple paths

Searched the forums

Still no luck

Any other suggestions - I guess we may have to reinstall office next?

Thanks 

Stacey