VB2012.net and Crystal reports

Question

Hello All, first time poster so please be gentle I have developed vb2010.net applications with crystal reports before and all running very well on various sites. I have now written my first 2012 application , downloaded the crystal reports 2012 developer edition and the runtime version from the SAP website and all running fine on my developer machine. Installed my application onto a clients machine, installed the runtime files and crystal reports will not work. I cant remember what I did to make it work with 2010. Can anybody help. F.Y.I. the client machines are the ones running my 2010 applications.