When I run XP Mode/VPC on Windows 8 (RTM) I always get an error message telling me this message that XP mode is only supported on Windows 7 operating systems. Compatibility Mode does not work either. When I run the installer for VPC, it gives me a error 0x80096002 - The certificate for the signer of the message is invalid or not found. Installing Windows Identity Foundation 3.5 does not solve the problem. Can anyone help me fix these errors?