well dude, i haf a gut feeling that you hafnt specified the proper virtual com port number in nokia pc suite. the other software probably automatically scans and finds the correct com port number. fire up that software and check the connection settings.
use the same port number in the connectivity settings in pc suite. it'll work.
ps: my uncle has nokia 6020. the latest version never worked. but version 5.8 works like a charm! so try an older version too.