It looks like Oracle does not support setting up the RAC within a virtualized environment running on windows. It must be Linux/Unix based.
http://www.oracle.com/technetwork/database/virtualizationmatrix-172995.html
Anyone successfully, in a production environment, running Oracle RAC 11.2.03 on Windows 2008? Are you using shared RDM's or the "multi-writer" mode as described in KB 1034165?
The VMware RAC Deploy Guide (http://www.vmware.com/files/pdf/partners/oracle/vmware-oracle-rac-deploy-guide.pdf) describes the configuration using the "multi-writer" mode KB 1034165 however the OS listed is only Oracle Linux. No mention of Windows 2008.