Episodes 1-2 plays fine. I reinstalled 3-5 however none of them will work. I have windows 7 and up to date directx. Have any ideas?

Did you solve it? Otherwise, can you be more specific, that is, in what sense they do not work? Also, describing your system spec helps in these cases (given that usually win 7 doesn't give problems with this game).

I have exactly the same problem. Eps 1 & 2 played fine right to the end but when I try to run Ep 3 it only wants to prompt a new game. I tried replaying the last section of Ep 2 to see if it would continue to three but that didn't work either. I have it installed on my work computer and I play it at lunch time - unfortunately it is a Windows Vista 32bit