basically we have not heard about a real incompatibility, though there might exist USB devices which crash the whole bus ....
a more probable reason would be a failed install ... you could try to follow this instructions:
> [Syncrosoft support advice]
> - please do a complete new installation of the Syncrosoft License
> Control Center in "Overwrite" mode by following these steps:
>
> a.. Unplug all USB keys
> a.. Download the latest Syncrosoft License Control Center from
> http://www.syncrosoft.com/downloads
> a.. Go to Windows "Start" menu, select "Run.", enter "cmd" and press
> [ENTER] -> This opens the command console window a.. Drag the
> downloaded installer of the Syncrosoft LCC and drop it into this
> window -> This adds the complete path to the file to the command
> prompt a.. Now add the overwrite option by typing " /o" after it,
> notice the space between the path/filename and the "/o" option.
> ( the capital o = overwrite)
>
> A valid command line should look like this now (attachment):
>
> "...\any path\SyncrosoftLicenseControlSetup.exe" /o
>
> a.. Now press [ENTER], this starts the Syncrosoft LCC installation in
> overwrite mode.
> a.. Now reboot your PC, when Windows has finished booting connect one
> USB at a time, allowing the Windows Hardware Detection to install each
> key by guiding it to do that automatically.
hth, christian