|I guess you could try a "restore point".|
Normally you can't play with one computer and mess up the other. I guess it is possible that your computer actually prints to his computer and there is the issue. Try the restore point.
If your computer actually prints to the printer then that would be odd. The settings on the printer would have been changed. Print out the settings page. Or just set back to default.
1/3 of highway deaths are caused by drunks. The rest are by people who can't drive any better than a drunk.