Error starting Commerce Gateway Broker 4, SP3

I installed Commerce Gateway Broker 4, SP3, and when I try to start the service, I receive about 5 errors in my application log:

“Detection of product ‘{00000000-0000-4000-D800-0000836BD2D2}’, feature ‘CommerceGateway’, component ‘{DB9DDFA3-87DC-4B2F-82D6-90228A5D3545}’ failed. The resource ‘’ does not exist.”

I’ve rebooted, uninstalled, reinstalled, to no avail. I also tried SP2, to see if it made a difference.

Any ideas? Does anyone have this product running?

I’m on Windows XP Professional.