Video but no sound on YouTube

Running the newest version of FF, Windows XP. Everything was working beautifully until I downloaded the ActiveX plugin when prompted a few days ago. Then the sound on YouTube got borked--I can see the videos just fine, but no sound at all.
I've tried uninstalling and reinstalling Flash, the Active X plugin, and Shockwave, to no avail. Can someone explain suggestions to someone who is in no way a computer person? Thank you!

Hello, I am not familiar with FF, using IE6. But what caught my eye is you said you downloaded the active x plugin "when prompted"
That is how I came to know there even was a F.P.10 update, a window popped up and said it was availabe and did I want to install now,
later or remind me later. I said, sure, install now. LOL I have since resolved my problem.
I know on the Adobe site, there is a download and install for Windows and one for FF.  Do you think the "prompt" installed on IE? I wouldn't think so, but it's a thought. I know you can switch back and forth from FF to IE
Also it might be a good idea to go to www.adobe.com/software/flash/about and Adobe will tell you if you have installed F.P. & they will tell you the version as well.
Like I said, not familiar with FF, but with IE, I had to go into manage add ons & update the active x of Shockwave Flash & Reboot.

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