XWE and Photoshop collide

I installed the photoshop demo last night, and today, I go to use XWE. I get this error message:
Failed to create key Photoshop.JPEGfile.9.
Then it goes into XWE, with a messed up menu bar.
It refuses to open up any wad file whatsoever.

After:

Reinstalling XWE
Reinstalling Photoshop
Removing Photoshop
Removing XWE
Disassociating the file...
It's still doing this.
I run on Windows XP.
Help?

Go to View -> Options -> File types and select "No file associations".