You have modded your game, you are not allowed to ask for refunds due to mod problems, and even if you did, the answer would be a solid "no."
Your problem sounds like you didn't install or activate your mod properly. What were you trying to install?
EDIT: Go to the Documents/My Games/Oblivion folder and delete the file Oblivion.INI. This might help if you were trying to install a UI mod and you didn't do it correctly.