(Don't ask me why, but I can't go to http://irfanview-online.com/vb/profi...do=editprofile)

I am on XP pro. I just upgraded irfanview from 3.85 to 4.20 and now I get this message:

Error: Windows can't play this file!

Windows error text: The specified file cannot be played on the specified MCI device. The file may be corrupt, not in the correct format, or no file handler available in this format...

Now it doesn't matter what version I use, going back to 3.85 doesn't work anymore, I get the same error.

I have read many times to "go to directshow option in properties> video."

I can't find this. Under options > properties there is only video/sound and there is no "direct show" there. Where is it?

I have downloaded klmcodec434.exe and still same error. I think that iview is not finding the codecs, but I have no idea how to fix this.

Any help is appreciated.