Some days when I try to play skyrim the previous days save are gone. why is this? I lost about an hour and a half and more before that. is there a way to recover them and yes ive tried to restore a previous version but it doesn't work because all I have are old versions not yesterday's . so what do I do?

How to Restore Lost Saves from Skyrim

http://www.youtube.com/watch?v=F0103EwIKW4

^{That's what I tried before but I only have versions from a moth ago not yesterday}

That's a problem then....

any idea what?

Try a program called ShadowExplorer. It finds "shadow copies" of lost documents and attempts to restore them.

From time to time, Windows Vista / 7 / 8 creates point-in-time copies of your files. This allows you to retrieve older versions from files you accidentally deleted or altered.

This service is turned on by default on all versions of Windows Vista/7, but Microsoft grants access to these copies only in Ultimate, Business, and Enterprise editions.

http://www.shadowexplorer.com/downloads.html

http://www.shadowexplorer.com/documentation/manual.html

Give it a try, but i don't promise anything !!!!!