avisynth 2.5 cannot decode Divx, Xvid videos.

[digicube]

I recently changed motherboard, upgrade CPU and memory, without reinstalling Windows XP. I don't know if the problem occured before or after this change. Avisynth 2.5 cannot find any codecs to decode my Divx and Xvid video, the audio plays fine. I use GSPOT to render the files and I have the necessary codecs installed. I tried reinstalling Avisynth and Divx, Xvid codecs but to no avail. The weird thing is I can still import my AVS script to CCE but not TMPGEnc and Mainconcept. I think the problem is Avisynth cannot locate the codecs installed on my system.

My script is just one line. avisource("C:\xx.avi")

Here are screenshots. Don't click the links, copy and paste into Address Bar.

ZOOM
http://www.imagestation.com/picture/sraid121/pf326af316a5c90e3672ecad2d54fed5e/f855b6c7.jpg.orig.jpg

GSPOT
http://www.imagestation.com/picture/sraid121/pfd8b55902e1399352fe4e95714c69d8d/f855ae4f.jpg.orig.jpg


MPlayer Classic
http://www.imagestation.com/picture/sraid121/p990bae4e514b939e448ea3102ebeb852/f855ab2c.jpg.orig.jpg


BTW, it's no just this one AVI, it's all AVI (MPEG-4), don't know about MPEG-2 and the rest. It seems Avisynth keeps looking for YV12 and YUY2 codecs for all MPEG-4 files, shouldn't it be looking for Divx, Xvid codecs instead?

[digicube]

I guess some MPEG-4 works. Divx 3 video works in Avisynth., Divx 4, 5 and Xvid does not work however.

[digicube]

I solved the problem by unregistering the file quartz.dll and then registering it again using Radlight Filter Manager. I got the clue from this Divx forum thread. I thought maybe DirectX 9 caused this problem.
http://forums.divx.com/viewtopic.php?topic=56315&forum=13