I am using Zorin 15.3 lite 32 bit on a Lenovo ideapad S10e. The issue is ClamAV’s directory of antivirus signatures. It tries to create this file in a root location which is normally locked. I have not created such a root account yet, as Zorin by default does not set one up. After some failed attempts I gave up and installed Comodo instead which seems to work well without such hiccups.