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This line is automatically posted in the bottom line every forum that I have written.

How has this remained in my computer for so long and not erased when I shut down?

< >youtube download
<a href= >youtube converter</a>
<a href= >youtube downloader</a>
<a href= >youtube convertisseur</a>
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Sounds an awful lot like malware. – Dracs Feb 27 '13 at 1:57
You sure this just isn't part of the forum software? There are very simple ways to add "ads" to users posts which would mean the action is harmless. – Ramhound Feb 27 '13 at 13:48

I would do the following:

  • check what plugins are installed in your browser and see if anything there relates to downloading videos, or to "soundfrost"
  • See if the problem persists no matter which browser you use. If it's not global, which one is affected?
  • run a full Malwarebytes scan
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