eraser.exe is the main executable for the Eraser software from Heidi Computers Ltd. It allows you to completely remove sensitive data from your hard drive by overwriting it several times.
Non-system processes like eraser.exe originate from software you installed on your system. Since most applications store data in your system's registry, it is likely that your registry has suffered fragmentation and accumulated invalid entries which can affect your PC's performance. It is recommended that you check your registry to identify slowdown issues