I have a virtual machine installed MS Windows Server 2008 R2 EE 64bit on it. I just installed successfully Oracle 11g R2 64bit client on it. I made a service from net manager and tested it which was successful. I also verified my oracle installation from command promt using SQLPLUS command and it confirmed me about the correct Oracle installation.
I installed Toad 10 versions 10.6.1 & 10.1.8 (one by one) and tried to connect the database, it shows dll errors mostily OCI.DLL not initilized. I tried to get it resolved with different ways but remained unsuccessful, although it is fine with Oracle 11g Client 32bit.