Everything happened in my sleep.

The problem is I don't know what really happened here.
I created a new wallet before I executed the transaction, and I did the transaction at home, very careful with the warning from the service and prudent with my password or my key---> I don't think my computer got hacked or my password stolen since I created a brandnew one and never clicked on any links either.

Then how the heck my Ether got moved from my wallet right after it moved in?  
Is there a chance toget my Ether back ?? ><

I sent a message to myetherwallet support but I doubt if I ever get the answer.