Yes!, now that i have completed Dragon Age Origins and Awakening, I can now play Oblivion!
Now you would be wondering, why do I need to complete Dragon Age Origins - Awakening?
It's because we have a rule here in our computer.
1st Rule: In order to install a new game, you have to complete your previous installed game.
2nd Rule: In order to play the new installed game, you have to complete the selected game.
3rd Rule: If you have been seen playing the new installed game without completing the selected game, Your saved for the latest that you are playing will be deleted whether you like it or not.
Well that's about it.
Oblivion was installed because my brother(witch uses this computer too) completed Dragon Age Origins - Awakening first.
It's like a game, completing a whole game will unlock something(like always), like Oblivion!