I just want to share my experience in the hope that this will help others.

I have installed the game on an external USB Pen Drive to avoid Texture bugs, this solved the texture problem but raise the numbers of freeze & quest bugs. After 2 or 3 hours of gameplay, the game became completely unplayable with a crash every 2-3 minutes (escalation of bugs seems for me directly related to the game progress).

I decided to remove the USB pen drive an play the game directly from the DVD Disk and "Et Voila!!!", Everything worked as a charm. I was able to play hours and progress in a good amount of quests without any single problems.

If you have installed the game on USB external drive and you have bugs and crash, try to remove the USB and play the game directly on the Game Disk. This could solve most of your problems.

Sorry or my bad English,
stid.

Yeah you have to have a pretty good USB drive to play installed games from them. Mine wont even let me play installed games from it. Just get a blank screen