I'd start with simply renaming it, so it doesn't run at the next boot. What happens?
My Vista computer have this command line window that appears with the message 'Uruchamianie nowego gadu-gadu' , and it seems that it is from 'winmsc.exe'
I have recently used 'CCleaner' and 'AusLogics Disk Defrag', and also used msconfig to make the computer boot with 2 processors. I was wondering if any of the above was the cause of the message appearing.
My computer is vista home premium 32-bit, service pack 1, intel core2 duo T7250@2.00GHz, memory 3GB.