When using the DBCA tool under Oracle 11gR2 64-bit on Windows 2008, and trying to specify ASM as the file storage, the following error is encountered:

“grid infrastructure or clusterware home not found”

The DBCA tool must be run as Administrator, even if the account you are using is already an Administrator privileged account.

If you launch DBCA from the command line, the CMD executable must be launched with the Run As Administrator option.