remove printer

Sorry for my bad English. Hi. I have a problem about remove USB printer via C#, Command-Line or PowerShell. I try to use C# APIs(with dll), Command-Line(printui, Devcon) and PowerShell(remove-printer, remove-printerdriver, remove-printerport). But It doesn't work only when the printer is...

I'm running Widows 7 64 Bit Pro. I go to the control panel and then I select Printers and devices. There are 3 printers in there that I have had. I got a new printer and I added the new printer and made it the default printer. Well there is still those other 2 printers that are gone now...