I just recieved an undate via windows for IE9. Hopes that this fixws some of the crashes.
PS. After restart IE 9 works a whole lot better. still the video issues but pages load a whole lot faster and more stable
Being that the computer is only 6 months old, you have 2 options call Acer and ask for tach support (it should be still under warranty) or there is an image partitioned on the disc and you can use that to reinstall windows. Remember to back up all data before restore.