It would be extremely difficult to remove sophos central from within the operating system where it is installed, However, by either plugging the affected drive into another computer -OR- working from recovery - command prompt, the SOPHOS folders can be removed from program files and program files (x86) on the affected hard drive partition. All hitmanpro files should also be removed.
Then reboot affected operating system and use hitmanpro uninstall ot delete remaining sophos files to CLEAN UP.
Steve K.