I may have missed this in the thread but; try un-installing the device first (don't worry, Microsoft will use it's own generic driver to run the display), then install the new (older) driver.
Also, what is the file type of the driver? Is it an .ini / .inf or a .exe / .msi?
Also note that when a driver is installed, it is copied to a system folder (usually under C:/Windows) where it is made use of. Removing your desktop folder shouldn't cause any issue, though to be safe I would recommend renaming the folder first and doing a restart to ensure that the system loads correctly.
Also, what is the file type of the driver? Is it an .ini / .inf or a .exe / .msi?
Also note that when a driver is installed, it is copied to a system folder (usually under C:/Windows) where it is made use of. Removing your desktop folder shouldn't cause any issue, though to be safe I would recommend renaming the folder first and doing a restart to ensure that the system loads correctly.