Jawahar/Ajay,
Crystal reports use 32 bit libraries from CMC-LaunchPad as well. if you want to confirm then delete your 64 bit driver and keep the 32 bit on the server and test the results.
@John, in your case you need to add the database login information in the reports from CMC. for this go to one of the CR reports in CMC and provide the database logon info in "Database Configuration" option.
Make sure you have the DSN created on the server where Crystal Servers are installed, it should be created under 32 bit ODBC(C:\Windows\SysWOW64\odbcad32.exe) with the same name created on your Crystal client.
Restart the Crystal Servers from CMC, your reports should work.
Thanks,
Mayur