Have you tried redownloading the Episode after reinstalling?
Maybe it's just a corrupted file.
Have you tried if it works in windowed mode? Press Alt-Enter to get there.
The igfx thing makes me think it might be worth updating your display driver.
It is also possible that your notebook (i assume) overheats.
It would also be helpful if you posted a dxdiag log.
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.
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.
Then e.g.
zip the file and attach it to a message.