I have yet to reach the part of the main quest where you eliminate the Sixth House base and contract Corprus. However, when I go to Caius he says I have the disease and will not let me go past the part where you talk to Zainsabi. I don't actually have any disease and none of my stats are in the red, however I have been in the Corprisareum and I've killed some ash creatures. Any help?

I've tried going to Tel Fyr and I can't get the cure. I have the Corprus Cure quest.

It is caused by giving Divayth Fyr a Dwemer Coherer before you were supposed to. This glitches you into the Corprus Cure quest. If you are on PC and have one or both of the expansions(GotY includes both expansions), you can use a "console code" to undo this.

SetJournalIndex A2_3_CorprusCure 0

If you are on XBox you will have to revert to a save before this happened.

Actually I saw that on the wiki and tried it and got an error message.

*EDIT* never mind I typed it in wrong >< thanks a lot for the quick response.