|I have the same view as #12 about RealPlayer, although I rather doubt it is the cause of this particular issue.|
Both "Rkill" and "Drop My Rights" are free. "Drop My Rights" will not fix your issues but is another tool in your armoury to help avoid infection in the future. It uses no resources and you don't even notice it is there. Can say more later if you go that way.
This is the proper link to YouTube Downloader (now called YTD):
The free version is fine.
One word of caution. Watch each screen carefully when installing free software. Very often they try to foist unwanted goodies on you, such as toolbars or virus checkers.
It's just a matter of unticking the appropriate boxes to avoid getting these. You probably already know this but I thought I'd mention it just in case. [DMR is from Microsoft and doesn't try to lumber you with anything else].
Always pop back and let us know the outcome - thanks