I just got a new Dell desktop (running win xp sp 2), into which I
installed an internal 2.0 USB hub and also plugged in a 2.0 external
hub, each with 4 ports.

The pc recognized the devices but gave warning messages suggesting
that they were not high-speed USB, so it seems to be seeing them as
1.1. The hubs are both 2-3 years old.

Any suggestions as to why this would be happening?