Here's what I've found with my computer:
About two weeks ago Adobe made an updgrade to Adobe Flash Player available and I applied the update, and YouTube and some videos stopped working!
I called Adobe and their response was that if I'd give them my credit card number they'd be happy to take a look. I refused.
Adobe Flash Player version 10 has problems supporting 64 bit internet routers. Version 11 is in Beta and a release date has not been identified.
The latest sub version appears to have distroyed the fix that Adobe had in the previous sub version.
Microsoft Internet Explorer 9 is a 64 bit based system tailored for and installed on all new 64 bit computers
. As is the latest verson of Apple. Both to take advantage of the latest Intel chips.
I'm in the process of getting one of my friends geeky sons to take a look.