I packaged a download for another Vanilla WoW Project. I built it upon the famous 1.12.1 torrent (the big .rar). I also verified that the WoW.exe is correct by installing from the original game disc, then patching it up to 1.12.1 patches that I have archived. It was indeed bit-for-bit identical, along with every other file.
Anyway, I have had several players complain to me, in the last 48 hours, that rundll32.exe is causing problems related to high CPU usage.
So far, all the players I have interviewed are running Windows 7. Someone offered advice to rename "WoW.exe" to something else, such as "1.exe", but this does has no effect.
I researched other projects and historical data from Nostalrius. This error did not happen in the past; yet, in 2 days, I have many players complain. Could this mean that a recent version of Windows is causing trouble with a .dll file?
For the sake of solving this problem, I will be monitoring this thread and sharing information as I receive it.