I have a music video that I downloaded but the website I got it from put their URL in the lower right hand corner of the video and it's there the whole time, any way I can get rid of that?
Not if it is hard encoded into the video file.
Is it a watermark?
There's a De-Logo filter available for VirtualDub which might do the trick.
Please don't ask me anymore about this as I've never used it.