You can put in another sim, the phone will tell you to enter the unlock code then.
SEMC 8.4 doesn't contain a virus. It's just the code of crack (I think it is the crack, but I'm not sure) that causes your antivir program to see it as harmful. But it's not.
You are missing a .dll. Had the same problem. Sorry, but I don't know which it was anymore and I'm going to go to bed now. Someone else will tell you the solution. If not, I'll have a look at it tomorrow.