Start -> Printers and Faxes -> File -> Add Printer
In the wizard, click Next, and uncheck "Automatically detect and install my Plug and Play printer"
Click Next, make sure the port is set for LPT1: (Recommended Printer Port), and click Next again
Choose "Generic" for the Manufacturer, and "Generic / Text Only", and click Next
If there is an existing driver for this printer, just click Next again
On the dialog labelled Name Your Printer, choose a name such as "Receipt Printer" and make sure it is set to be the default printer. Click Next.
Share or do not share the printer as desired. Click Next.
Print a test page or not. Click next. Click Finished.