Hi,
You may download the drivers from thew Microsoft Update Catalog by searching yout ptinter model, be sure to select the one intended for your PC architacture:
http://catalog.update.microsoft.com/v7/site/Search.aspx?q=Laserjet%206P
You may follow these steps to get help installing the drivrs manually:
http://support.microsoft.com/kb/323166
Shlomi