Just to make some points if someone has still some interest (I just found this topic).
No states in the eastern block were considered themselves as "communists". They were socialists as sgrig noted. Furthermore socialism means different in the east and in the west (in east I mean basically the eastern european former socialist states, since the asian and african version of socialism was quite different because of the cultural differences).
So we (as I grew up in Hungary) were socialists because everybody could see in these countries that we're not in the communist paradise yet, we have to work hard, we have to deal with some differences in welfare etc. That was the main reason why socialism was invented, just to point out continously that "yeah, we're almost there in the communism, we just have to work for it a little bit". And nobody knew what will happen if we reach communism so it was pretty safer for the party to say we're just on the way.
From the west - mainly because of the media usage - this two sometimes means the same, maybe communism was more popular because socialism similar to "society" or "social" and these words could not be argue as evil that easy.