The second step is to open the Photoshop program folder. On Windows, this is "C:\Program Files\Adobe\Photoshop " by default. If you installed the application with the Creative Suite or if you customized the installation path, this may vary, though.
The trick is to rename these files, so Photoshop won't be able to access them. I advise you to append ".bak" (for backup) to the file name, so you can change back later if you want to. I would recommend against deleting them.
If you are using newer version of Photoshop which has the the beloved Activation feature (the CS and CS2 versions if I remember correctly), you need to perform an additional step. If you skip this, Photoshop won't start because the activation wizard thinks it's being fooled.
If anything went wrong (I told you you are doing this at your own risk!), don't despair, a re-install of the application should fix your problems.