If you right click on a printer and delete it, this doesn't remove the printer driver from the machine. Sometimes when working with print servers and testing multiple drivers there will be times when you need to completely remove a driver package from the machine so you can install a new or different one.
Windows Vista and Windows 7 has a tool called the Microsoft Management Console (MMC) built into windows which you will use to remove the drivers.
Instructions
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1
Reboot the machine and login as "Administrator".
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2
Go to the start menu and start typing MMC, you will see the Microsoft Management Console shortcut appear in the start menu; click on it.
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3
Go up to the file menu and select Add/Remove Snap-in...
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4
Then scroll down in the list and select the "Print Management" snap-in and then hit "Add".
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5
At this screen you are going to want to select "Add the Local Server", hit Finish, and then hit ok.
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6
Then you can scroll down to your computer name, select the drivers tree and then right click on the driver you want to remove and select "Remove Driver Package".
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7
Make sure you reboot your machine before trying to add new or different print drivers.