I have had a problem on both my laptop and PC that youtube vids load incredibly slowly if at all. Same on some other sites. Both running 64bit vista and latest firefox.

Well today I solved the problem, everytime I had tried to install the flash plugin from adobe.com the installer said I had to close firefox before it could proceed, I do so then when firefox loads up same problem. Just installed it manually following this guide and now youtube works perfectly like it used to!

Not sure if it is 64 bit OS or vista causing the problems but I am running high end processors with 2GB and 4GB of RAM respectively.

http://www.howtogeek.com/howto/inter...efox-on-vista/

Hope this helps solve the problem for other users too.