ob1.exe is a OffByOne
belonging to The Off By One Web Browser
from Off By One Productions, a division of Home Page Software Inc.
Non-system processes like ob1.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.