In Eraser 5, the only thing (as far as I know) that is running in the background is the scheduler. There is an option (the exact details of which escape me, as it is some time since I have had Eraser 5 installed) not to have the scheduler start with Windows. Set that option, and restart the computer. If that doesn't work, come back, and we can do the same thing via the Windows configuration utility.
David