Black Screen After Starting Windows.

Edit: Still have a black screen with the mouse cursor.

Most likely because it just put it right back to the way it was.

While you need a video card driver you might not need the one you're trying to use, or you might be trying to use the one you've installed with settings that your monitor or system can not actually support/handle. And for a monitor you almost never need a specialized driver. The standard monitor driver that comes with windows is usually enough for anything, especially if you've got problems like this trying to use the custom one.

When you've removed it, install the default vga drivers over it before trying to boot back in normally. That should give you the horrible resolution but your full normal environment to work in and try to set it up right.