palading

Well it has come to attention that my accounts on runescape have been hacked, i hadn't logged on for a few days and i logged on thismorning to help a mate out , so i logged in and i was in draynor and i thought thats strange i thought i logged out in varrok, anyway i lost about 400k and 15k bronze arrows and 10 k iron arrows, not much i no but still, most of my better stuff is stored on another account luckily...... Any getting to the question i was wondering if there was anything i can do apart from running a virus check, that would make me safer and/ or the ability to find anything about what happened.... i am still not sure what i downloaded or recieved to get this virus and im usualy quite cautious ???? anyway anything inparticualr i should do ...