hi. i just installed a fresh xp pro to my laptop and i noticed that the graphics are "waving" like a curtain. after the XP logo with black background and it goes to its "welcome" screen the monitor is like a curtain the fades from top to bottom like a curtain being opened, like a waving motion. from the desktop, opening windows, i can see a slight "waving motion" too. when i open an mpeg file with full screen mode you would see like "frames" movie not a flowless motion. it's like frame1 then frame2 but the mpg file is a contonuous file when i open in my pc. what could be wrong? monitor driver? graphics card? i have an hp paviliion ze5155. thank you.