I went to google, took out the underscores in your error message, put some speech marks either end of phrase, and it returned
this.
Couple of results were worth checking, namely
here(bottom of page query 25) and
here, important bit being
Hey Rails how you doing?
I came across this problem once before, it seems the problem is a piece of badly written script associated with a HP all in one printer.
If the "WindowsFormsParkingWindow" is in XP (ie shutdown). Make sure you don't have HP Image Zone Fast Start (hpqthb08.exe) in your startup folder
Any joy?