I have a Pentiium 2 running Win 98 1st edition. I was having trouble so I re-installed. System was running well. So I proceeded to loaded my McAfee anti-virus 6.0 CD and was going to download updates. The system kept locking on bootup. I wiped out teh drive and re-installed again. Everything was working well until I loaded McAfee. So I wiped out the drive again, installed Win 98 2nd edition and teh computer booted fine. No problems. Then I installed a new McAfee anti-virus and Firewall 7.0. Immediately it began locking on bootup. As soon as I uninstalled McAfee it booted completely again, no problems. I installed 7.0 and it locked up on bootup. I uninstalled 7.0 and it booted fine. Any ideas why?