As of a few days ago I've been getting a message thatwon't go away.
When the computer finishes starting up, a window pops up called "InstantShareDevices". Below that it says "The feature you are trying to use is on a CD-ROM or other removable disk that is not available", followed by "Insert the 'InstantShareDevices' disk and click OK".  Below it a drop down menu called "Use source" appears with an option of "1".  There are three buttons of "OK", "Cancel" and "Browse".  It just won't go away. If I click "cancel" another error message comes up with the title of "Microsoft .NET Framework" title with a message of "An unhandled exception has occurred in a component in your computer application.  Click, continue and application will ignore this error and attempt to continue". When I click "Continue" it goes back to the first error in an infinite loop.

Does anyone know what this is and how to take care of it?  Thanks

Are you using any HP devices--Printer, camera etc ?

Yes.  I have a HP Photosmart 8250 photo printer attached.

Try uninstalling and then re-installing your HP software.