Did you enter the serial numbers when you installed? Did you deactivate the old installations first?
I think this error message is telling you that the program is not activated, possibly because there are already two other active activations. Try Help > Activate... and either it will be successful, or you will get some dialog telling you why it isn't. If it isn't there should be a phone number included that you can call. If it is successful and you continue to get this error, then we'll need to dig deeper.