Have you been a victim for the new "Legal" threat there is circulating for some time now on the internet? I haven't heard of such thing before until one of my friends told me about it earlier today since he got it on his computer yesterday and so far I haven't got it yet (of course you can't be absolutely sure these days can you?) . What he told me is indeed scary and that's about a new "legal" trojan called police.trojan aka ransomware by security experts and one of them is from Sweden (sorry only a Swedish blog), which has some indications of where the trojan has its origin, but haven't been able to examine the trojan more intensively atm.
To make it simple... You're falsely accused for crimes you didn't commit and they have locked everything on your computer plus they demand you to pay penalty of 100 euro to unlock your computer and once they receive your money (some people are reporting that they pay 100 euro, but have their computer being unlocked hell no they haven't and are still locked) your computer will be unlocked, but in the mean time they steal every piece of information you have stored on your HDD. Your best bet to get rid of this trojan is to read this information provided by another Swede since he also got this "legal" trojan into his computer and managed to get rid of it based of his computer knowledge. Information like this or this might be helpful too.