Windows 7: bad quality video playback..??

Hey everyone. I am having, I believe, the same issues.
On my monitor and on my TV when I watch an avi or a dvd the playback is quite "pixelated". It looks like the video is being played in a low res. I have tried multiple players including MPC, as stated above. I have tried different drivers as well.
Looking for some more ideas.
Thanks a lot.

Same problem here. It seems to look great in a small window but when you go to full screen its very pixelated. All edges are very UM..it looks like tiny boxes stringed together. I have downloaded codec packs and play files on both VLC and WMP. I get the same results.

Hi all.
I have the same issues. It appears to affect Live-Tv broadcast's viewed and recorded/playback through Media Centre and WMP.
As a side note i installed Media PLayer Classic and discovered that this has no issues with viedo qaulity. I have also updated all my DirectX compenants. I am not using any additonal codecs (aside from those installed with Power DVD 9 Ultra). My Windows 7 is brand new with no other programs installed.
There is very bad artifacting in HD Videos displayed. On this same machine with the same hardware using Vista Ultimate x64 (dual boot), i had no artifacting.
I've checked my video card drivers, powerdvd settings etc. Nothing stops the artifacts.

Is there anyway to adjust video settings for uncompressed video formats like dvr-ms in Windows 7?