Viedos not showing up on your pc from Vimeo or you tube is 1 of 2 things :
1 - you dont have a macromedia flash player , because you tube and vimeo players are a program like windows media player or real player and its called macromedia flash player , if you dont have flash on your computer you will not be able to view vids , so try downloading flash :
http://get.adobe.com/flashplayer/2 - you are not activating activeX scripts , or flash scripts and this is controlled from tools -> internet option -> security - > custom level . "and thats what makes the vids not working in the school but you will no be able to change this functions on schools computer for security issues it could be changed on your laptop if your connected to schools internet "
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1 final note , Internet Explorer is nice , but some times the student becomes better than his teacher so all the netescape family browsers are better in every thing concerning browsing the internet so try using : Fire Fox - Google Chrome "but it will spy on you as all google applications" - Safari , they are all free and better that IE .