Hello Donlongley,
This happens if you or someone else have installed a piece of software that needs some additional information that reside on a disk, anyway you can workaround this issue by disabling this software from the start-up.
here is what you need to do, restart your computer as usual and wait for that message to come up, now try to recognize the name of this software and write it down. (its ok if you can't get a name).
Now remove it from the Start Up items by doing the following:
- Press the windows Start button and choose Run or (press the "WindowsLogo + R" on your keyboard)
- Type "msconfig" without quotes of course, in the text box and hit enter or press ok.
- If you are running vista the System Configuration Utility may ask you for permission, click on Continue.
- Once the System Configuration Utility has started, click on the Start Up tab.
- Disable all the softwares that you do not want to be on the start up.
- Click ok and restart your computer, that prompt will be history now : )