Unable to Add Oracle Datasource in Windows 7 64bit

• OS: Windows 7, 64bit.
• Installed OracleXE 11g.
• Trying to create a new data source under system DSN, by going through control panel and administrative tools.
• However, Oracle drivers are not listed.

Solution:
The data source dialog is for 64 bit clients. In case Oracle client installed is 32 bit, then you open the 32 bit dialog using:

C:\Windows\SysWOW64\odbcad32.exe

 or under your respective windows folder