Stumped by WP5 problem

I’m trying to solve a problem with an HP4000 printer on a PII 400 running windows 98 and wordperfect 5 through a DOS window. Ever so often the printer produces a blank sheet with smiley faces when printing from the wordperfect and even mpre serois sometimes it freezes the whole machine. The setup used to work on a windows 95 machine and the beta version of Win98 and I have tried using the latest drivers for both wordperfect and windows. Short of reverting to the old system is there any effective and lasting fix?