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I just installed itunes update and airport update by mistake :( Now my system unable to see any ethernt card on my machine, I check the system report and there is no ethernet card there. I used time machine as well but no use. any idea, should i install Lion all over again?

I use an ordianry bluetooth dongle it detects a magic mouse after some effort but its lagging and some time mouse just hangs for few seceonds, any idea what should I do... Is it the kext that needs to be edited (which i dont know how) or is it the dongle itself. Thanks