Don't use root explorer, so I can't help there, but it sounds like you need to make it gain root access so you can read/write. If you have a terminal emulator, and a working knowledge of *nix commands, or just the ability to type this in, this will work.
Download the bootanimation.zip and place it somewhere on your sd card, preferably at the root of your sdcard, which is what these instructions will use.
Open the terminal, and type
su
cp -r /sdcard/bootanimation.zip /data/local
reboot
It will reboot, and should show the red eye boot animation. To save yourself more commands, make sure it is name bootanimation.zip when you put it on your sdcard.
*Edit
Also works with adb shell from your computer, if you have used that before.
Alternatively you can delete the boot animation that sholes uses.
su
cd /data/local
rm -r bootanimation.zip
reboot