Does a little green arrow appear in the taskbar while U play the video?
If , so double click(or right click) and change the upside down (rotate) settings
Anyway, here's a little help for your codec pack:http://forums.winamp.com/showthread.php?threadid=219978
If it doesn't work, I recommend uninstalling your current codec pack and downloading and installing the Klite codec pack.
And even if U do still see it upside down, U should be able to fix that by clicking the green arrow in taskbar with this pack .