Vista may display the words “Test Mode” in the four corners of the screen if you install a driver that’s not signed correctly. I was able to remove the words from the screen by following instructions that I found here.
- Push the Windows key. This will open the program search bar.
This is the name of the command-line prompt.
- Type CTRL+SHIFT+Enter. This will run the command line prompt with elevated (administrator) privileges. Elevated privileges are required to make the change.
- Vista will prompt you to continue.
bcdedit.exe /set testsigning off
and press return.
- You should see the words The operation completed successfully.
- Reboot Vista.
What Does This Do?
It’s possible that this does something nasty. I have not noticed any ill effects to date.