I highly doubt the attackers will decrypt any files. It would be better if you could restore a backup.
Either way, you should install an antivirus and always backup your files.
Had company anti-virus installed as well as a back up drive.
For some reason my computer last checked into the server for AV updates one month ago. As I said earlier, my continuous backup I thought was happening wasn't. Nice concept in theory, but apparently not worth a wooden nickel.
I may have already stated that I did in fact get back a single important file, and I have read that many people have gotten their files back once they paid ransom.
Is it a risk? Yes. But it's only money, and I'd gladly lose it for a chance not to recreate weeks of work.
This won't be happening to me again I assure you. At least not without backups of backups in place.
Regards,
TB