Deleting the folder should be sufficient to remove EB, it's getting RTW reinstalled that requires you to hack the registry and stuff. And you did follow the installation guide, so you have a backup of your clean 1.5 RTW, right? Delete the RTW installation where you installed EB and make another copy of that clean one.

If you did not make a backup copy, you'll have to do the registry stuff.

The background picture you have indicates to me that you have non-"US English" characters in your username. The EB installer cannot handle this, so you have two options:
* Create a new user on your computer using only "US English" characters, such as EBInstallerUser or a or whatever. Login as this user and install, then remove the user again.
OR
* Install 7-zip and open the EB installer with it. Extract all the files you see there into your RTW folder.

If you need further instructions please ask specific questions saying what you've done (like you did this time ) and what you are trying to do.