I can confirm this experience my daughter's desktop pc, Windows 2000, suddenly did the same and she managed to take some notes which I am deciphering. I have only just found this forum item with msqrsm:exe, I have deliberately inserted the colon.
However in our case an attempt was also made to download the program msinexecs:exe. of which I have been unable to find much information. Some hints found on a Norwegian site.
PC run Sygate personal Firewall, AVG free, Adaware, Spybot search and Destroy so far we don't think we have found anything about where it originates.
Date noticed 19th or 20th September, in Belgium
I ask the same question, how can it get 'out' with the firewall running and giving no notice.
C