No sound on internet, but there is everywhere else

so for the past month i can't hear any audio on the internet from sites like youtube and myspace.music and it happens on every internet site that tries to play sound.  i've looked at sittes for weeks trying to find a fix.  at the beginning i would get a pop up after my computer started up saying "TVagent.ex - Entry point not found.  The procedure entry point PowerReadACValue could not be located in the dynamic link library POWRPROF.dll"  and i would close it and it would appear right away again and i could close it 100 times and it would continue to appear.  i have scanned computer for viruses with norton and nothing, so i went into norton and clicked "not allow startup" on TVagent.exe so i dont get the popups.  ever since the popups started the sound stopped.  PLEASE HELP!

You may try this applescript program.
log "  --- Starting on " & ((current date) as string) & " --- "
-- percent
set volume output volume 35 without output muted
Start the AppleScript Editor
/Applications/AppleScript/Script Editor.app
In Snow Leopard it's at: /Applications/Utilities/AppleScript Editor
Copy the script text to the Applescript editor.
Save the text to a file as an application and do not check any of the boxes below.
If you want access to the script from your Script Menu, move the script (the saved script application file) to your
~/Library/Scripts folder. You can also drag it to your Dock or make an alias for it on the Desktop.<br><br>
To debug, run the script within the Applescript Editor. Click on the event log tab at the bottom of the window. Click  on the run icon.  The results from the log statement will be shown at the bottom of the screen.

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