Nostalrius Begins - Quality wow vanilla realm (1.12)

Tried opening and play today. Logged in and said i needed a patch? Clicked restart and it says "can't apply patch". Advice please.

Has also somehow affected my retail WoW - went to load it up and BOOM started the 29 gig Download in launcher..What the ?!

Have also noticed Retail and Nos are both messing each other up - clicked Nos wow in folder and it opened retail launcher. I am sure there is a simple answer to all of this, I am just oblivious.

this usually happens if you wtf folder is set to wow blizzard, you might want to check that and not patch anything.