Final Cut Pro 7 : Exporting Problems

I have strange lines in my final cut pro 7?
ok so when im editing there are no problems in editing playback its fine but when i export it using quicktime and i play it i allways get blackouts and stuff like this... it will be fine like this...

http://gyazo.com/3ca5a75c02ba97cfff10251e0f77b0a5

the suddenly like this...

http://gyazo.com/0d14a2b39229f7ea22cd3a85b24421d0

then fine for a sec. then like this...

http://gyazo.com/0d14a2b39229f7ea22cd3a85b24421d0


throughout the video like this occasionaly...

http://gyazo.com/9a1a2d9d36eda1b844ef65fa1ff9dec1

please how do i stip it being like this in every video?