Movies playback slow or show green?

Hi all

Im having a problem, 90% of my movie files seem to start ok, then play slow with the audio staying normal?
i have noticed this since installing Windows Media Player 10? also on my sisters brand new PC with MP10 and codecs the same problem???

Also, some movies that worked fine previously are showing up green????

Do i need some new codecs or something?
Thanks in advance

 

Oh and also,
I get a display saying 3vix expired every time i try run certain files?

Thanks
Im on Windows XP Pro sis on XP Pro SP1

 

Anyone know what this could be?
please

 

Try removing all the codecs you have installed on your PC. Then download a program called FFdshow, bacsically it install every single codec known to man. Just google it.

 

I figured it out myself, you have to go to
Tools/Options and decrease any hardware acceleration.

thanks anyway

 

no problem.