Thanks, ok I clicked on the COD3 High Def video and all worked fine, I notice a lot of flash on the site, how do you control flash on your browser? Also check how your browser handles NEW WINDOWS as I notice that happens too.
Do you use Firefox? Have you the latest version of Flash for Firefox and ensure you have the latest version of WMP.
Failing that you could try removing the k lite codec pack and using divX (a suggestion not a clear solution)