Super is a video converter which is pretty good and flexible. I use it by myself. However, it won't be able to increase the quality of the video or repair any damage. I usually use "Videofixer" to do such things.
If the quality is rather blury, then it might as well be a cam-coder video with a low resolution. Not much you could do in such a case....

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"Never Argue With An Idiot. They Will Drag You Down To Their Level, Then Beat You With Experience"

again, thankyou so much for your help! Signing off