I have a late 2011 MBP 15" with the 2.2 GHz i7 processor with 4 GB of RAM running 10.7.5. Recently, after backing up a huge amount of movies to a portable HD and then deleting many of the huge movie files, as well as watching numerous movies -some simultaneously- I started to notice that my fans were running at high speeds and the CPU temp was running at close to100c at times and between 70c and 80c with no activity. The GPU and GPU diode were running hot as well. Both fans were running between 4000~5800 rpms depending on the heat level of the CPU.
I ran Activity Monitor and noticed that the Process Name "mplayer" (with the Parent Process "launchd") appeared 3 times and each was using between 99 ~ 102% of the CPU.
After googling this problem I came across a simple solution that had worked for another CPU hog -mdworker- with the same Parent Process:
Restart your MBP in Safe Mode and then restart again in normal mode. That's it...
The Process Name mplayer no longer appears in the Activity Monitor and my CPU is now running at 39c~51c and the GPU is running much cooler. The fans are running at 1900 ~ 2100rpms even when running Firefox, streaming audio in iTunes, reading documents in Preview, and watching a HD movie using Quicktime.
As an aside, the Recovered files folder that appeared in the trash had 3 copies of a MozUpdater folder containing updater.app and updater.ini files which probably doesn't have anything to do with the problem (but I find it interesting that there were 3 copies).
Again, that's:
Restart your MBP in Safe Mode and then restart again in normal mode. Done and done.