Many thanks for all your advise! I tried Carl's "best advise" (which sounded really great!) first, but - alas! - the program works only in 32-bit machines, and mine is 64-bit. Then I tried to use warpin to install the macwrapper (even though it was already installed with the wrong drivers during the installation of RC6) and - wonder of wonders! - it told me right away that I had an Intel 4965 a/g/n (8086:4230) chip in my T61p computer - just what Lewis said. I tried without success to uninstall the wrong drivers, but could not. (I am not too good with these things... probably my fault.) Finally, I reinstalled eCS2.0 RC6a from scratch, this time with the correct genmac drivers, and wireless works just fine now. Many thanks again for your kind help to all of you!