Why can't my Mac play wav or wmv files?

I have recently become unable to view and listen to wav and wmv files. I have all the latest updates to Quicktime but, while Quicktime launches, it doesn't play the files. Are there some settings I don't know about? If it became corrupted, wouldn't the updates have fixed that? I can look at Youtube videos, just not the wav and wmv files people send me.
On a possibly related note, it seems that the videos I view on Youtube are jerky - Like my computer can't keep up with the data stream, and skips frames in order to keep up with the sound. I hope I'm making sense. Is the problem with memory (or lack thereof)? I have a bad block, which has been worked around (I did a reinstall). Could that be the cause?
Thanks in advance.
Fred J.

wmv files: you need to download and install Flip4Mac WMV Player from http://www.telestream.net/flip4mac-wmv/overview.htm (Windows Media Player for the Mac is no longer supported, even by Microsoft).
YouTube Flash: yes, very likely your oldish Mac is no longer up to it, but:
The latest version of Adobe FlashPlayer can be obtained from here:
http://www.adobe.com/shockwave/download/download.cgi?P1ProdVersion=ShockwaveFlash
(You can check here: http://www.adobe.com/products/flash/about/ to see which version you should install for your Mac and OS.
You should first uninstall any previous version of Flash Player, using the uninstaller from here (make sure you use the correct one!):
http://kb.adobe.com/selfservice/viewContent.do?externalId=tn_14157
and also that you follow the instructions closely, such as closing ALL applications first before installing. You must also carry out a permission repair after installing anything from Adobe.
NOTE: On December 8, 2009 Adobe announced plans to drop Flash Player security support next year for Mac owners whose machines run PowerPC G3 processors.
"Adobe will be discontinuing support of PowerPC-based G3 computers and will no longer provide security updates after the Flash Player 10.1 release," said Adobe in the same advisory that spelled out the seven patches. "This unavailability is due to performance enhancements that cannot be supported on the older PowerPC architecture."

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