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I have Home Premium, and I've been getting this message about every hour for a week:
"Windows Image Acquisition Service"
"There is no application registered for this event"
I get no other info, just an "OK" button.

Since my new computer has weak USB ports in the back, I've tried two different PCI USB cards so a couple of things will get recognized. Only while those cards are installed have I gotten the message. I've tried a System Restore to before the message first appeared, but it still comes up.
In looking for possible clues, I started the Task Scheduler, which gives me these two messages:

Hi guys, first post.

In the Control Panel I select Hardware and Sound. I then select Sound and click on Manage audio devices. The Sound dialog is displayed and on the Playback tab I can see a registered item for Speakers. If I select the Properties and then click the Custom tab there is a tickbox called S/PDIF Enable. But when I enable the tickbox the OK button is available but the Apply button is permanently disabled.

I'm using the optical-out connector from my on-board sound card into my external DVD/amp and it all works ok. It's just that everytime I reboot I have to go into the control panel and do the above to set the S/PDIF tickbox. This is on my own PC at home. I have full administration rights (supposedly). But why doesn't Vista allow me to use the Apply button to hopefully set the tickbox permanently? I'm using the Home Premium version.