If there is a particular reason that you need to uninstall Sophos Antivirus, then click Sophos AutoUpdate in the Change/Remove programs, and then click Change/Remove button, after that choose to uninstall Remove Update.
Use Sophos antivirus? Warning!
A working exploit for Sophos 8.0.6 on Mac is available, however the
techniques used in the exploit easily transfer to Windows and Linux,
due to multiple critical implementation flaws described in the paper.
Testcases for the other flaws described in the paper are available on
Sophos has responded with a post on the multiple vulnerabilities and responds over and over that ‘Sophos has seen no evidence of this vulnerability being exploited in the wild’. But is that really good enough? How about issuing a fix in the two plus months they’ve known about these issues? It only takes one wild exploit.