Hi Thomas,
As Tommy has stated this is likely fixed in the latest version, however to confirm if you carry out these steps and send to Symantec support they can advise:
1. Get System information (Start-> Accessories -> System tools -> System Information or in command prompt type systeminfo);
2. Send BIOS version;
3. Send BIOS HD mode (AHCI/IRRT) and describe the devices that are affected at preboot (USB Keyboard and Mouse).
They should clear it up pretty quickly with this information, and let us know how you get on with this.
Cheers,
Michael