With Bitcoin you are the boss! That not only means you are in charge, but that you must work. Bitcoin security is no better than your security. If used correctly it is miles above the bank's security system. However if you do not protect your private key then no other methods matter.
I don't know how this happened to you, but someone must have gotten that key. Consider who else has access to your computer. Think about where you store your private key. This breach may not involve malware at all. Also, Think about a more secure OS like Linux.
Sorry to hear about your loss.
Look at the picture from my 2nd wallet:
http://tinypic.com/r/ddsw0/9There is no address in transaction. The label "нeдocтyпнo" means "no acsess"
It seems it's pretty strange
No information about the transaction? That is strange. You did a lot of things right, using the long password with no words. That rules out guessing your password. You are using good anti-malware. That makes malware a little less likely.
If you wrote the password in a document or on a slip of paper you may want to check the security on that document. It may also be worth asking yourself "who else knows I have bitcoins and has access to this computer"?
What a bummer. Can blockchain.info give you a Tx ID? That may give some more information.