You see, the problem is that, for this network card, there apear to be 3 drivers working at the same time in a clean installation of linux mint (my case 16 mate desktop, but also happened in 15) using lsmod showed that:
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cfg80211 401436 3 iwl3945,iwlegacy,mac80211
What you have got to do, in a terminal sudo caja /etc/modprobe.d/blacklist.conf and blacklist iwlegacy and mac80211, and that's all, problem solved.
Hope this helps somebody, the reason i post this is because when you google for this problem, all the solutions you will find are 1 or 2 years old and will send you to modify a iwl3945.conf in the modprobe.d which doesn't exist in that folder