It looks like this problem was caused by a codec problem, I'm not sure what exactly caused the crashes but there's an easy way to fix this.
Here's how to prevent the crashes:
- Go to the Start menu, click on Run and enter cmd. This will open a command window.
- Enter this into the command window: regsvr32 /u shmedia.dll
- This will disable the movie preview feature in explorer. If you want to turn it back on you have to type regsvr32 shmedia.dll into the command window.