Patcher crashing when trying to run PWI

You should have given the things you've tried so we'd know where to go.

This is a checklist of things to try.

1. Remove Arc completely and reinstall it. Then try to run it. That worked for someone.
2. Try running the patcher through the Arc bypass method. Go to the "Program Way" or "Manual Way" on this post (ignore the first part, it's irrelevant): http://pwi-forum.perfectworld.com/showpost.php?p=22451171&postcount=2
3. Remove PWI and reinstall it
4. Make sure you have ownership permissions on the PWI folder. If not, there is a fairly simple solution: http://www.howtogeek.com/howto/windows-vista/add-take-ownership-to-explorer-right-click-menu-in-vista/