Problem with monitor(Full HD)

[meodowla]

I'm using ASUS VH242H LCD monitor.
Its native resolution is 1920x1080 @ 60Hz. While playing videos, lots of noice appear over the video. Is there any way to avoid this. Its not in the case of games(I've played Colin Mcrae DiRT). I've tried HD videos in mkv formats and Original DVD movies.

 

[meodowla]

Additional info:
Monitor connected to CPU via DVI cable.
System configuration:
AMD Athlon64 X2 6000+ 3GHz
ASUS M3N H/HDMI mobo
2x2GB 800MHz Corsair RAM in Dual Channel
Coolermaster Silent Pro M600 PSU
Welgate 160 GB SATA
MSI HD4850 512MB
ASUS VH242H LCD monitor