Ok, I downloaded the Archmage hak, it worked. Then I tried the hak where it gives a ton of new prestige classes (lich, archmage, Disciple of Meph., etc). I've done everything right (erf. files, etc), the only complication is that the PRC-installer won't work, everytime I try it. Any ideas?

Well, don't use both of them at the same time is the first thing I'd say....

No no, you plug the hak into a modual, I've put both haks in different moduals.

Sounds like a question that should be asked to the creator of the module. Also search the comments thread, generaly someone will have had this problem before.

If it's with the program itself then you need to talk to the creator. It maybe something to do with the custom tlk file though since tlk's were modified this last patch. Are you also sure It's compat with 1.62?