It should save automatically but I suppose you can use phones to end your shift
Hey, I've read about the bluesreen thing in the other topic. No, it never happened to me, but try running it in compability mode and administrator mode.
In THEORY, if you only have 1 save file, you should only have 3 files in your www\save folder. config, save1, and gloabl.
It's super weird that it's not letting you auto-save, but maybe try adding the game folder as an exception for your anti-virus? It's just a random guess though...