You could try just installing the standard ATI drivers from their website. However, some of the files may start to conflict with each other! If they don't conflict then you could try deleteing the omega driver folder from your drive and then remove the entries from the add/remove list by editing the registry. There are loads of good guides on the net on how to do this. If you can't find any of them then let us know and I will find one. Kinda in a hurry right no so don't have time to go a huntin' fa' one :P
REMEMBER TO BACKUP YOUR REGISTRY BEFORE YOU EDIT IT!!