Hi there,
i am working here in a quite large office and had to setup a new user account on my windows pc, because to inital account was not able to acess certain things in the network. After that was done, zBrush lost its activation, and neiter as the old user nor as the new i am able to use zBrush. Since i did not deactivate zBrush in the first place (nto ecpecting such a mess) now i dont have a activation code … 
What shall i do to fix that?
Heiner
Solved i myself, the Activation programm on the web was smart enough to help!