URGENT!!!!! Please Answer ASAP

ok well i was playing d2 and when i exited a game it brought me out and said realm down so im like ok w/e so i waited and it wouldnt join in my game cause of lag so when i canceled log in i got a message saying something like "The Software in use is using a invalid CD-Key" so then i start to flip out. So i resart the entire computer and it lets me in so i log back in with my zon and it gives me an error kicks the entire game and have to restart...But heres the catch it only does it on my zon, she has no hacked items and no mh is active...anymore yet i can still use my other characters...can someone please answer me with a response to what they thing it is...friends say blizz is scanning me...but idk please hurry ty