Ordinarily, you can't copy text from a Windows popup or error message. GetWindowText is a tiny portable app that will let you grab the text from any window so you can easily Google that message.Windows is known for its cryptic error messages and codes that you need to Google to troubleshoot, but the popups with those nessages don't let you copy text. With GetWindowText, you can just start up the tiny app, drag its icon to the window you want to copy, and it will display its text in a text box, so you can just select the whole thing, Google it, and get to troubleshooting your computer. It's a perfect portable app to keep hidden away in your troubleshooting folder, so when the time comes, you don't need to copy that error message letter for letter. Hit the link to check it out.
Note: For obvious reasons, we couldn't cause an error on our computer to test this app, but we used it on the Recycle bin dialog and it worked like a charm -- see the above image.