Wipers stopped working

i have 7 seater 06 Renault Scenic and the front window wipers have stopped working. I've located the fusebox to give this a try (right side inside the bonnet)

But there is two large screws Ive never these type before holding the fuse case in place. Is there something special I need to loosen them, dont think any of my screwdrivers would move them. Any helps appreciated