I've used this adapter with excellent results:
http://www.newegg.com/Product/Product.aspx?Item=N82E16812224011&cm_re=usb_to_parallel-_-12-224-011-_-ProductWorks fine with an old Laserjet. By the way, Windows 7 has built-in support for virtually every Laserjet. Just go to the Printers folder; Add Printer; Add Local Printer; choose the virtual USB port (this will be there after you plug in the adapter); then click on Windows Update -- this will update the list of printers. Once it is finished the printers list will be populated with a large number of printers -- and will almost certainly include your Laserjet. No other drivers needed :-)