"You have contracted Helljoint"

^ is there a mod to remove these pop ups (apart from DarUI)

You can actually make this mod yourself, very easily. Start the Construction Set, go to Gameplay > Settings. Scroll through the list until you see sContractedDisease. In the String Value box to the right, delete the text:You have contracted. Save your mod. And that's it!

Sorry I dont have the CS....

http://www.nexusmods.com/oblivion/mods/11367/?

I am sure there is a mod around for this. Wrye Bash lets you remove a bunch of messages, but this was not one of them.