call of duty united offensive problem

[nbrugato]

hi guys, im new here. i have vista home and i installed the call of duty game just fine under vista and now im trying to install the united offensive expansion pack, i have tried installing it under 98 and xp but the installation still fails. right after i put in the key code and agree to the thing and hit next it goes to a loading bar that doesnt move, so i hit ctrl alt delete and sure enough its not responding and fails to install. i know it can be installed because i have read many forums and stuff but i need help. thanks

 

[gothnezz]

is you disc free from scratch & fingerprints?

 

[nbrugato]

yes, its like brand new.