YouTube videos no longer play on Macbook Pro

I don't remember the exact time that this started but I keep getting "An error Occurred Please try again later".   W\hen I try to watch a  Youtube Video.  This happens on Safari and Firefox with Mavericks.
I can watch some YouTube videos from other websites but there is no sound.  I can watch a video on Facbook from Firefox  but the same video in Safari will only play for a few seconds without audio then stop.  This happened on other sites with videos.
About 2 weeks ago I had some Malware.  The guy from Apple cleared my caches, removed Flip4Mac and did some other things which caused a bunch of other issues.  Firefox was like I had never had it set up.  All my bookmarks and extensions were gone.  I had to completely rebuild it.  However I believe I was still able to see videos after that I believe.  I had a lot of problems with settings being changed.
The other new things is last Friday I got a new Zoom modem.  I'm not tech savvy so I have no idea if that could cause this kind of problem. 
Can anyone help me?  I don't have a clue where to start with this. 
Thanks
I just restarted my computer and some videos are playing with sound in Youtube and the one I couldn't see on Facebook in Safari is working but other's will not play.  Is that just the video?

1. System Preferences >  Flash Player > Advanced >  Delete  All
    Press the "Delete All" button.
    Install Adobe Flash Player.
    http://get.adobe.com/flashplayer/
   Download it first.
   The next step is important.
   Click Safari in the menubar and select “Quit Safari”. 
   Follow the prompts and install it.
   Restart computer. Relaunch Safari.
2. Allow  Plug-ins
   Safari > Preferences > Security
    Internet Plug-ins >  "Allow  plug-ins"
    Enable it.
3. Safari > Preferences > Privacy > Cookies and other website data:  
    Press the”Details” button. A sheet will drop down.
    Enter YouTube in the search box at the top right corner.
    Highlight the YouTube entries that show up.
    Click the “Remove” button at the bottom, then “Done”.

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