Conquest of the Horde

I don't seem to be able to do this. All I can find online is "3.2.0 to 3.3.0" and even higher numbers. I spent an hour downloading a "3.2.2 to 3.3.0" patch, only got it to tell me that it was corrupt and couldn't open "battle.net.dll" or something similar. It's been ages since I last updated, and it doesn't seem like I can get the game to autoupdate either.

Has anyone had this problem?

I think to get the auto-patch back you have to go to realmlist file and change the patchlist (not realmlist) back to the retail version.
WoWwiki has a large database of patch links. I personally use http://wowmirror.altervista.org/ but you should use that at your own discretion.

Windows Vista? Try executing the patch as an administrator. Right click on it, Run as Administrator.