Go to msconfig as suggested by DavidR, in the "startup" tab, make sure "ashDisp" has a tick beside it. OK, and exit, restart.
The note will come up after reboot, advising you have made changes to the way Windows starts. Tick "Do not show me this or run msconfig at startup again" (or message to that effect) and OK.
The effect of this will be to add the above file to the startup, which won't affect the startup time very much, but should enable the icon.