Ubamous, in the best-case-scenario, the WordPerfect suite installation disk should be incorporated within the system restore disks. Check if there's a disk for software or applications. If there's no cd, the hard-way of doing the uninstall would be to get a good-quality registry cleaner/fixer application like jv16 or perhaps registry first aid.
I'd first backup the registry entirely ( and/or do a system backup in WinXP so the process could be reversed if all went awry). Then I'd boot to safe-mode and manually delete the program files for the suite and the common file Corel applications. Next I'd run the registry cleaner to find and fix vestigial registry entries. Last, I'd reboot and watch everything carefully. If things became horrible, I'd revert to the last secure backup of the system with XP restore (or some such).
That said, I still use WordPerfect suite and much prefer it to MS Office. I'm not sure why you want to uninstall the program. Ah well, each to his own. . . .