Cannot view any Videos on Youtube after installing flash 10

Hi there.
I had my day off today and have been viewing videos on youtube all day.   I had adobe pop up to say that I should upgrade to the newer flash version and I did this. Afterwards I went back to youtube to continue watching the videos and now I get an error message "An error occurred, please try again later."
I have followed all the advice I could find.   I uninstalled all adobe programs and rebooted the comp then installed again and I still get the same thing.   I downloaded the offline uninstaller and ran it 5 or 6 times then reboot and installed and again same thing.
I am using Vista and I have never had any problems with viewing videos.   I use Firefox as my browser, but Internet Explorer is experiencing the same difficulty for me when I checked it.
Please help me out.   Tried to figure it out on my own but I'm stuck.
Thanks!

Sounds like the problem I was having. Places like YouTube kept asking to upgrade to a new version (which I did) and to check that I had Javascript enabled (which it was). I tried installing new versions of FlashPlayer on several occasions and they seemed to work, but FlashPlayer 10 was clearly not working.
I found a support page http://kb2.adobe.com/cps/494/cpsid_49419.html that directed me to use the standalone uninstaller, then use a Microsoft SubInAcl Registry tool to fix some pemissions in the registry. Then I installed a new version of FlashPlayer and everthing has been working well since. I have no idea hour the registry permissions got messed up in the first place.

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