Are you sure your player hasn't got a colour correcter turned on? In WMP for example you and go to "enhancements" and then "video settings" and change it from there. What video player are you using?
when you say tint do you mean totally pink with a just visible outline of the action behind them? If so then i have that and it only happens with WMV files for me. It isnt the colour correction in my case i know that for sure
I had this happen to me once too, but a reboot solved it. Never did understand what was causing it tho.
This happened to me once too, all my video files / dvd's became quite pink, was quite odd, i found that updating the graphics driver seemed to fix it. I still havn't worked out what caused them to turn pink in the first place.