Jamesr,
Go to download.com and download the latest Divx codec pack and the K-lite codec pack standard edition. There both free of charge and easy to download. If you have both of these components added to your machine, you will be able to view just about any kind of vid (avi, wmv, flv, gom, divx, xvid, and much more).
Good luck and let me know if this works!
Secret Pearls