Oracle Database Discussions

At our windows 2008 server machine we have installed Oracle 11g 64 bit server and from the client machine we created a net service kcp4 which is running successfully.
When we are using Windows 7 32 Bit as client machine with Visual Studio 2010 and Oracle 11g Client 32 bit and creates following connection string i.e
" Provider=OraOLEDB.Oracle.1;Data Source=kcp4”
But when we are using Windows 7 64 Bit as client with same Visual Studio 2010 and Oracle 11g Client 64 bit and creates the same connection string to establish connection with Oracle 11g server.
We are getting such error -“oraoledb11.dll” is not registered on local machine.
After that we also tried to register oraoledb11.dll through “regsvr” and got message oraoledb11.dll has been registered successfully.
But unfortunately the problem still continues “oraoledb11.dll” is not registered on local machine.
So, kindly advise the solution.
Regards
Vinay