Oblivion Quest Problem

[Twinblade]

I have recently restarted Oblivion again as was bored of my Argonian and after doing Azzan's first Fighters Guild Quest - The Rat Problem I try to cash in the reward with the woman with the rats, but it keeps crashing on me and kicking me out.

I can deny that Quill is involved and cash the reward that way, but lose out on the free training, but when I go see Quill and advise her I kept her secret, it crashes when she offers me her free training as a reward.

I cannot complete this quest as a result because Azzan keeps sending me back to the rat woman for completion. Anyone else had this problem?

 

[Twinblade]

Its an oblivion crash, as everything else works fine. I have no mods in use at the moment.

Therefore it leads me to think that its the choice of dialogue that causes the crash, as if I select the alternative dialogue with rat woman its fine. However, it then crashes at Quill.