Some time ago after reinstalling Windows system I had a problem with VS 2003 and SAP Connector. Everytime that I tried to open my SAPConnector project I got error “Unable to load librfc32.dll”.

After some research I’ve found solution. I installed Microsoft Visual C++ 2008 SP1 Redistributable Package(from here) and the problem was gone. So, if You have also experienced this kind of errors working with SAP Connector, try to install this package and see if it solves Your problems!