Demoshield Runtime error

I have the following Problem: I have 2 machines with XP Pro. One is a ABit Motherboard with an AMD 2800XP processor and ATI Radeon 9600XT video and the other is an eMachine with an AMD 1800XP processor and onboard video. RTCW (Return to Caslte Wolfenstein) game installs perfect and works great on the eMachine but not on the 2800XP. Every time I attempt an install, even accross my LAN, I get the following error: "DemoShield Runtime Error" The installation hangs before it begins. The same error appears when I start the CD by autoplay, manually through explorer or across the network (shared device) from the known good eMachine. Im sure the CD is good for reasons already stated. I have scoured google, gaming sites and vendor sites, but have come up with very little. What I have found is Demoshield is a program written by a company called "Install Shield". From what I've read I'm assuming Demoshield is used as an intro movie to the installation. I made sure my DX9.0b was current, installed quicktime, installed realplayer and checked WM9's update just in case it called for any files from these programs yet still it hangs on install with the error message. Also, I have Nero installed if that matters. Any help would be greatly appreciated. Thank you in advance.