Star LC 10 is 15-year old (at least) matrix printer (I can't remember whether 9-pin or 24-pin), and there are no available drivers for it on Star Micronics site.
Depending on the mode (there was a DIP switch), it can work as IBM-compatible, or Epson LX/LQ compatible. Windows 7 has drivers for Epson LX/LQ, so I would try these first.