To be honest I don't remember if doing a repair / install will do the trick. But uninstall / reinstall will for sure.
As for the 32 bit / 64 bit runtime. The path to the 32 bit runtime will be:
C:\Program Files (x86)\SAP BusinessObjects\Crystal Reports for .NET Framework 4.0\Common\SAP BusinessObjects Enterprise XI 4.0\win32_x86
To the 64 bit runtime it will be:
C:\Program Files (x86)\SAP BusinessObjects\Crystal Reports for .NET Framework 4.0\Common\SAP BusinessObjects Enterprise XI 4.0\win64_x64
The assemblies will be in GAC. You should not need to need to worry where these are as simply adding a reference to, say crystaldecision.crystalreport.engine and compiling as 64 bit, will make VS load up the correct files.
- Ludek