1 pi$$ed off newbe

hi first of all id like to give props to you guys for a kick ass web site,thats why iv turned to yall for help, my house was broken in to last week ,and i didnt mind them taking jewelery tv some cash,,,but not my vaio! so my ? is this,is there a way to trace them or my computer ? i know they have been online with it becaquse they have been browsing the friends network under my profile!luckly i already changed my important passwords. so if anyone can give me a few tips id appreciate thanx in advance

 

thank you for theuick response, the only reason i know he used my account is because i hardly ever used the profile viewer and when i recently logged on it had a least 20 views on it , i did contact the police and they said they normally wont go that much in to the investigation unless its very serious then it would be a case 4 the fbi, so other than that i have nothing?for all i know they prob reinstalled windoews aleready so i might as well forget it , thanx anyway 4 your help