my computer works fine, but sometimes a command prompt opens with the file name c:/xxut.exe. it started after i signed in on msn yesterday and it appears like 2 or 3 times every hour. and when i close it, the end now screen appears, and when i press end now, it says that windows cannot end the operation it may need more time to complete. what is this file? is it harmful? i ran malwarebytes and it says that there are no infections.