I tried reverting to SP2 and then ran through the above suggestions but I'm still experiencing the same problem. One interesting point is that whenever I uninstall the H8000FW driver I get the following error in WinXP: "The application or DLL C:WINDOWSsystem32H8000asio.dll is not a valid Windows image. Please check this against your installation diskette."

Is there any older version of the H8000FW driver available I could try?