I have like a week with my iphone, I passed a video from my pc through itunes 7.5, I tried to watch it on Ipod->Videos and it game the next message
"This Movie format is not supported"

Also in youtube I can't see any video, I can navigate but whe I about to see the video it show the same message. "This Movie format is not supported"

Anyone know how I can fix this problem?

I tried to reinstall File Downloa webplugin.app, but I cant find the native application of Quicktime.

Thanks for your time.