Annoyingly, some parts of certain Windows screens won't let you copy the text. However hard you press the mouse button, the cursor stubbornly refuses to change into the shape that tells you it's allowing you to copy the text. The solution is a small program called GetWindowText. It's a tiny 0.05 MB download that works on all versions of Windows from XP onwards (I personally tested it on 8.0). It's free, portable, and malware-free according to VirusTotal and Web of Trust.
Download Link: http://www.softwareok.com/?Microsoft/GetWindowText