If you have no backups, about the only solution would be to pay the criminals and hope they deliver. They might, but of course, if they do that, they will be encouraged to try the same again.
It the files are too valuable or too important (bank documents, tax info, etc.) that you absolutely must have, then you may want to pay the ransom. But there is no guarantee that you won't get infected again and be forced to pay again.
But I'm from the school that you don't pay thieves, who then use your money to make themselves stronger.
If you don't have a backup of your files stored somewhere that is not on your system (usb flash or external drive) and they can be considered a loss, then the preferred method is to wipe the system and reinstall fresh.
"Fool me once, shame on you. Fool me twice, shame on me."
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