I cannot download and convert videos from Youtube using Firefox v31 and Downloadhelper v4.9.22

This has been a problem for at least 18 months. I receive updates to Firefox and Downloadhelper as they become available and am registered so that I can use the conversion process.
I've looked through the support pages but they don't help me to fix the problem. If a fix exists I would prefer it to be a "Click this button" rather than lines and lines of revised code.
Please help, soonest would be nice.

I can confirm that as of this morning I have v4.9.23 of Downloadhelper. I have manually updated SilverLight, to 5.1.30514.0, and the red warning on the Plugins page has now gone away, I now get an Up to Date message.
I still have the Youtube problem. I have closed and restarted Firefox but have not yet done a cold boot of my computer.
I do have 5 unknown plugins that Firefox says I need to research, these are for
Microsoft® DRM
Windows Presentation Foundation
NPCIG.dll (this relates to a Canon image gateway)
Windows Live® Photo Gallery
Google Update
The .dll will have come along with software with my camera but I have not idea about the rest.
Now whether the DRM is causing the problem I don't know but I am running Microsoft .Net Framework 3.5 SP1 and Windows Media Player 11. For info my PC is running a legitimate copy of Windows XP SP3.
Thanks for the continuing help.
Nigel

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