You can copy/paste your GameSaves out of your GameSave folder and into another place when you delete everything. Then when you reinstall you can copy/paste those saved characters back into the new GameSave folder. But if you've already uninstalled everything, I don't think they are still there. Your game characters are saved in C:\Documents and Settings\Administrator\My Documents\My Games\Oblivion. Look there and see if they are still there.
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