Is it Windows 7 64bit or 32bit
... check if this works for you
http://social.msdn.microsoft.com/Forums/en/sqldataaccess/thread/685eacc1-a670-42d4-8392-924230fa90cb
Try to find "odbcad32.exe" and execute the file
You can find the file located on
C:\Windows\SysWOW64\odbcad32.exe (IF it is Windows 7 64 bit)
and
C:\Windows\System32 (IF it is Windows 7 32 bit)