new user magesh has a problem

iam magesh, recently i to linux ubuntu...
iam using 8.04 hardy, and iam not able to play any video though i have
install all the codecs and needed players....
i had asked question IRC but no one gave a solution

when i play a video once i see only a green colour screen on the player
sometimes audio also(but only green screen)
when i play the video again without closing that green colour player
screen.... the video is seen clear....
so everytime i wanted to watch any video i am double clicking it twice( two
players appear but in only one the video is played.... i close the other....
this is my problem.. can any one give me a solution
because iam facing this problem for 1month

Thankyou
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