You can start the Shivering Isles questline by going to the island in the middle of the Niben Bay. The Knights of the Nine can be started by going to Anvil and speaking to the Prophet.
The GOTY edition is just the regular Obivion, but with DLC. So it may be used on the regular Oblivion.
No
try downloading a patch because you have the same computer as me
Oblivion
you play the game
If it will not play, I suggest buying a different copy.
yes, oblivion is the next game of the Elder scrolls story line.
you can complete all of the oblivion gates you essentially beat the game its an open ended game and you can do anything what i have done is install mods to change the game it is encouraged by the developer, there is about 4,000 mods so you could play the game for years and never play the same thing twice
because you haven't bought the game RE-DEFINE YOUR QUESTION
Fallout 3, another RPG, is made by the same developer of Oblivion and is currently available for PC.
It's impossible to get to Castle Oblivion in KH2, but it does appear in a flashback during the beginning of the game while you play as Roxas.
Once you've chosen your class that is what you'll play as for the entire game.