I will point out sophos is a horribly un-customisable piece of uselessness.
That's why education bodies love it.
I too would say try read only, but that might stop it working.
I've had sophos on this machine - uni gives it out free - and it never detected and 1.6 stuff as a virus. It's probably because it tries to run a server.
Best thing you could do is get a laptop with it on, or find a privalidged username, as they are sometimes immune to AV scans