User.exe problems…..????

Does anyone have any ideas to solve invalid page faults with USER.EXE? We are using Corel WordPerfect 8 with DocsOpen as our document management program. We are also using Groupwise 5.5 for e-mail. I have been getting both errors:
“WPWin8 causedand IPF in module USER.EXE”
and “NOTIFY caused an IPF in module USER.EXE”
This has happened on a Compaq Deskpro w/ WIN95 and also on Compaq Prosignia w/ WIN98. Any ideas would be appreciated.