How to reset the looks of the Command Prompt window, in Windows?

Try deleting the entire HKEY_CURRENT_USER\Console key (export it first just in case) from the registry. It's re-created when you customise any cmd window again, and seems to have done the trick for me in Win7.

To reset windows console (CMD):

• Create restore point of your system (Important).
• In start menu type RegEdit right click it and run as admin.
• Now if you modified your console before, you should find a key like this: HKEY_CURRENT_USER\Console\%SystemRoot%_system32_cmd.exe
• Only delete that key i.e %SystemRoot%_system32_cmd.exe
• Restart your system and check your console (cmd) now should be back to defaults.

Is this what you are looking for?

You can also check HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Command Processor registry key and delete all the values (upon reopening cmd the default values should be set).