If the saves are being reverted to an earlier version, MS must be syncing in the wrong direction when you are back online. Can you disable cloud support for the game, to test?
That is a bug if the quest doesn't complete when you pick up the second pyramid. That can be caused by not getting it before leaving Cyseal for the first time, and a couple people have had an issue even getting it before then.
In the report, the Display Devices section of the dxdiag file is blank, and the DisplayAnalysis.txt file doesn't list any supported resolutions.
Check for updated graphics drivers, and Windows updates in general.
Try a clean re-install of the nvidia drivers. See here
, for example.
Try checking your system files:
- click Start, type cmd into the search box, right click Command Prompt and select run as administrator.
- type the following command and hit Enter
When that is done, type exit and hit Enter, then reboot your computer.
For more details, see: https://support.microsoft.com/en-ca/kb/929833