Is it like what you read in https://www.google.com/search?q=osiris+ransomware ?
The best thing to do is to go back to your latest (image) backup and certainly not pay them.
I woke up this morning and my computer looks like it was restarted in safe mode. There are some icons on my screen having to do with this Osiris.. Is this a virus? There are some sites that claim to fix this, but they may have something to do with the virus in the first place. What do I need to do?