in theory,yes.in reality,depends on how good their support is..not sure what your problem is though-unreadable files on cd? incompatible version? missing cd key(s)?

but dont get your hopes too high-for example,I had a very unpleasant experience with steam and their sorry excuse for support,I have purchased half-life1 (2nd copy),and the key was already in use..to make a long story short,they have basically told me to go f**k myself,they have my money already and some dude from europe aint going to have the gut to sue them anyway,so what the hell,lets just stop answering the emails and ban him from the forum,that will do the job nicely (of course they didnt say it so bluntly,but you dont need to be a rocket scientist to get the meaning)..

got rid of the game,and never installed steam again..lets hope you wont experience something similar..