When i try to play a video wiyh i-tunes then the i-tune player stops immediately. Why? I have windows 7

Hello there, Stavtil.

The following Knowledge Base article has some good pointers on troubleshooting issues with video playback in Windows 7 using iTunes:

Troubleshooting iTunes for Windows Vista or Windows 7 video playback performance issues

http://support.apple.com/kb/TS1718

Thanks for reaching out to Apple Support Communities.

Cheers,

Pedro D.