Navigate the the location below in your registry and make the corresponding change.

Printer name is found in the [HKEY_CURRENT_USER\Printers\Settings] key.

Windows 95 
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Windows] 

Windows NT/2000
[HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows] 

Value Name: "Device"

Data:printer name as found from above