Press Alt and F2
Type yast and press Enter
Give your root password and press Enter
Go to Software Management
*img267.imageshack.us/img267/4572/yast1jx6.th.png
In Filters Click on Patterns
*img245.imageshack.us/img245/417/yast2da8.th.png
In that Select GNome Desktop Environment, and then click accept
*img180.imageshack.us/img180/9476/yast3tb2.th.png