I really can't play anymore becasuse of LAG!!

I can't play PPD anymore because of the lag in the backround video I have tried everything to sort it out, I've uninstalled the game and re-installed it, I've tried the Dxtory way and I've uninstalled ffdshow and LAV filters ad re-installed them. Can someone PLEASE give me a better solution to this problem because if i don't i can't play PPD at all :'( (I'm on windows 8 if that helps with anything.)

Use worse quality movie / audio file / blackmovie mod with 1.00 value

I think I've worked out what it was, when I was disconnected from the Internet my PPD ran fine with synchronised video and no lag from the notes so I play PPD without connecting to the Internet now. (I rarely play the PPD scores it's more JohnnyKLawliets AC scores)

BAD NEWS: my PPD has lag again no matter what I do AGAIN :'(