Subwoofer, if you properly installed WMP 9, then WMV files should play more than rarely. Having said that, some websites have setup their streaming video in ways that are incompatible with Macs. Some are compatible, but claim not to be. Others play perfectly fine. There is still another group that plays in MacOS X 10.3, but not in MacOS X 10.4. Oh and let us not forget that there are DRMed WMV 9 and WMV 10, neither of which are supported on the Mac. Your videos can play on MacOS X, just not within a browser window. My best guess is that you need to reinstall WMP 9. This will automatically reinstall your Internet plug-in.