Final answer:
To fix a scrambled display caused by setting the resolution too high in Windows, boot into low resolution mode and then adjust the display settings to a supported resolution.
Step-by-step explanation:
If a user set the resolution in Windows too high, resulting in a scrambled distorted display, the best course of action would be to boot into low resolution mode. To do this, you can restart the machine and press F8 (or the appropriate key for your system) before Windows starts to launch the Advanced Boot Options menu. From there, you can select 'Enable low-resolution video' to boot Windows with a lower resolution setting. This allows you to access the display settings and reset the resolution to a level that your monitor can handle.
Note that upgrading the video driver, booting into the recovery console, or checking the video connections would not resolve an issue caused by setting the resolution too high, although these steps could be relevant for other types of display issues.