Like the gentleman above, I also got the ""Failed to open archive interface.MPQ:"

Steps I did.

I had 5 existing WoW folders. 1 in the default, and 4 on my C drive. When I deleted Data and Updates from the 4 folders on my C drive (it's not called Patch), I linked them just as the instructions said to do (to my default wow folder C:\Program Files\World of Warcraft).

When I did this, it deleted all the data in my default installation folder. I no longer had any files in C:\Program Files\World of Warcraft\Data or Updates. I could not replace it, since I deleted the Data and Updates folders from my other installations.

I am now reinstalling WoW....and will have to redo sooo many macros/addons etc.

I did not make a mistake. I did exactly as the instructions above say to do. I work in IT for a living, so it's not like I am a novice at this type of thing.

I will try it again once I have reinstalled/updated etc. I will post the results....and a fix to the above instructions incase someone else makes the mistake of doing this.