Win 98 SP3? The software isn't compatible with Win 98 which is an obsolete operating system anyway, do you mean XP SP3 by any chance?
Try running the MVT to see if it will effect repairs: http://mvt.mcafee.com/
If not try a complete uninstall in the normal way through Control Panel/Add or Remove Programs
Then use the MCPR removal tool listed under Useful Links above, reboot and reinstall your software from the online account.
Also make sure that your operating system is totally up to date using the Custom check in Microsoft Updates (as against Windows Updates) and that utilities such as Java, Flash etc. etc. are also.
Also check for and turn off any software that may compete with McAfee.
When the MVT is finished post the log here.
Yes Win XP! Many thanks for this. I did everything you said and it seems to have righted itself. Strangely though, I'd re-installed and run MCPR and MVT several times before, as did the Level 2 guys.
Isn't that weird. Nothing surprises me any more...LOL.
Anyway, all the best.