directX error while installing titanium

[thehighwizard]

hello my friend is trying to install eq titanium on his pc, using the same ISO's i used. he is getting a error. ill post a screen shot of it. i have spent the last day trying to figure ut a work around with no luck. so ill ask here. thanks P.s this error happens after the install asked you to put disk 1 back in after your done with disk 5.