I don't know if i can help much here, but have you already tried
verifying your game cache files?
Also in order to rewind:
In the games main menu click "Play".
On the next screen select a savegame, and click "Play".
On the top of the next screen select the Episode you want to play.
At the bottom you should see "Back - stats -
rewind - play/continue"
If that doesn't help, please post your dxdiag info.
dxdiag
Windows XP: Go to your start menu and click on run. Type in "dxdiag" and hit enter
Windows Vista / 7: Press the windows key on your keyboard
or click on the start menu. Type in "dxdiag" and hit enter.
Windows 8: At the start screen, type in "dxdiag" and hit enter
Now click on the button that says "save all information".
It will prompt you to save a file. Save it where you can find it.
Open the file and press Ctrl+A followed by Ctrl+C to copy the contents, and paste them in a reply by pressing CTRL-V.
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