If your Windows box is running NT, 2000, XP, or later, you could simply enable Print Services for Unix. Here are the steps for Win 2K:

Log in as an Administrator.
  1. Open the Control Panel
  2. Open Add/Remove Programs
  3. Select Add/Remove Windows Components
  4. Scroll down to Other Network File and Print Services
  5. Select it and click Details...
  6. Check the box for Print Services for Unix
  7. Click OK
  8. Click Next >
  9. Click Finish
  10. Close Add/Remove Programs
  11. Open Programs : Administrative Tools : Services
  12. Scroll down to TCP/IP Print Server
  13. Right-click on it and select Properties
  14. Change Startup type from Manual to Automatic and click Apply
  15. Click Start
  16. Click OK
  17. Close Services

Now you only need cupsd on the KNOPPIX side. Add a new printer using LPR/LPD protocol; you will need to know the IP address of the Windows box and the printer's share name (= LPD queue name).