Whilst a member of Oxford university you are entitled to some software packages.
One of these packages is Sophos Anti Virus.
It is just a case of downloading the relevant installer for your machine and running it.
It will the update the program via the internet to keep your machine secure.
As part of the registration process to access WorcesterWifi the machine will need an antivirus to be installed.
The download for Sophos can be found here:
https://register.it.ox.ac.uk/self/software?swp=sophos