Call of Duty Install Trouble

are u saying when u insert the disk the splash screen only gives u the option to "play" the game which wont work cos the game isnt on the HDD??

if so try:
a: going into control panel => remove programs and seeing if call of duty is in there and can be uninstalled although unlikely it will if it is in there as it will need the uninstall log.

B: explore cd one and manually run setup.exe which imo should work

C: the risky one... i had jedi knight 2 on my machine which bjorked and wouldnt reinstall same prob u have with CoD so i got me a registry program and searched for anything with jedi knight 2 which i deleted and then on a gamedisk reinsert the option to install came back.... so u could try that as well BUT try what i say in order abc and finally messing in the registry can make yur pc do strange and not so wonderful things so only use as last resort and dont blam me if u delete something important and yur pc dies

"Its only when you look at ants closely with a magnifying glass on a sunny day that you realise how often they burst into flames"