Today I wanted to take a screenshot of the UAC window that comes up when you run a code signed, manifested, well behaved installer! But this is not possible with normal screen capturing programs such as Snagit. The reason is that when the UCA window pops up, all operations are halted and the desktop locked down. After some digging around I found this excellent article on how to disable the secure desktop while you take such screenshots. Just make absolutely sure that you enable the secure desktop when you are done or you have a security breach on your computer. Take a look at it here:
This shows you step by step, screen by screen, how to do this in Windows 7. This is the first time that I have had a need to take a screenshot like this and this was an invaluable blog post for me!