Ms. Low-Tech confronts Windows 7

. . . and loses. :(

I've been word-processing on the computer as a secretary for over a decade, and have never before encountered a problem stopping/deleting a print job when I accidentally chose the wrong file to print. Seriously, folks, is turning off the printer really the only way, in Windows 7, to stop/delete a print job that's already begun? Who designed this program?!