Hi,
There may be few reasons why you are getting the error "Cannot find 640X480 video mode," please check if your Windows computer is still up to date. Since you have been able to try other steps in your pursuit to resolve this concern, you might as well check if your computer is updated. Click the link below to be guided on how you can keep your PC up to date. You may also want to try upgrading your computer system to Windows 10 to help avoid these kinds of issues.
Please update us of the result for us to help you further.
Regards.