Question is in the title, I had some friends visit and attach their PC's to my network. Ever since then, even long after the PC's were no longer attached, I am still getting entries for their PC's showing up in my Network folder of Windows Explorer, even after I refresh the view. How can I clear these out?
Answer notes: To aid the search of others later, it turns out that the second half of harrymc's answer was the correct part. I went in to my router (THOMSON TG585v7) firmware and found a list of computers under Home > Home Network > Devices screen. Hitting Configure on this screen let me delete old computers off the list and as soon as I did that, they no longer showed up in the Network folder.