Have you followed step 1 correctly? and do CTRL+ALT+DELETE to get Task manager, go to processes tab and close anything that says ad.exe or mangos, realmd, etc. Files which are in the Mangos folder or you can restart your pc, follow step 1 correctly which is Copy out the empty maps folder into the World of Warcraft Directory and also Ad.exe into the WoW directory and then run ad.exe which will take about 5 minutes depending on your pc to copy all the maps for WoW.