|If they have actually been encrypted then there isn't a lot you can do - usually after the files are encrypted you are told to pay £xxx to get the encryption password - it's called ransomware, but it's worth checking a couple of other things.|
Select one of your pictures and try renaming it so that the suffix (the bit after the ,) is back to its original state - .jpg .bmp or whatever & then see if you can view it.
If this doesn't work then open Windows Explorer, click on the 'tools' menu and select 'folder options', click on the 'view' tab.. Look down the list and select 'show hidden files...' and also remove the tick from 'hide protected operating system files....' . Click 'OK'. then open the folder that held your photos and see if they have re-appeared. There's a chance the malware may have just copied your photos and then set the 'hide' attribute on the originals.
Post back if either of the above work so you can finish off the clean-up.
"I've always been mad, I know I've been mad, like the most of us..." Pink Floyd