At the first sign of trouble with this sort of ransomware it's best not to touch any keys or the mouse and simply hard power off using the power switch. Better lose unsaved data than your sanity fighting these things.
Reboot into Safe Mode (any one of them) and initiate System Restore to before it all started. It's outlined in the last link in my signature below.
If successful temporarily disable System Restore to delete the infected restore point.
If not, there's a good guide here: http://www.bleepingcomputer.com/virus-removal/remove-united-kingdom-police-virus
Is that the one you experienced?
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Ex_Brit has given you invaluable advice. Especially in regards to powering down immediately. if I may add, here is another Reputable removal guide, to basically remove all the different versions of the Police Ransome trojans-variants. It involves the system restore procedure as well.
HERE is the link: http://malwaretips.com/blogs/remove-police-trojan/
Scroll down the Page- Options/Steps on which to take,
Thank you Guys for you're input on this problem, followed your advice and I now have a PC free of ransomware.
That;s great, good luck.
Glad that all is okay !
All the very best,