Reinstalling will cause Eraser to start up again automatically, the installer creates the start up entry. You'll have to disable Eraser's start up again.
The startup entry is disabled. I uninstalled/reinstalled and disabled the startup to see if a clean version would fix the issue, it didn't. As a clean install didn't fix the issue for me I'm guessing this is a (minor) programming bug that affects more then just my pc.
If that still doesn't work, you'll have to manually check the HKLM\Software\Microsoft\Windows\CurrentVersion\Run key for Eraser's start up entry.
I've never really played around with the reg, so I don't know what i am looking at. This is the content of said file, I can't see any reference to an eraser file:
Windows Registry Editor Version 5.00