Do a virus scan but consider that it may just be a very wide ban that has affected you. Subnets, domains and even TLD's and 2LD's can be banned temporarily or for ever, depending on the seriousness of a drone invasion or spambots. It is often the case where innocent people are affected this way and there's not alot that anyone can do about it. You could try emailing the administrator of your network, quoting your IP address and seeking some clarification on why you are affected but they do not always reply to such emails. This also depends on what network is involved.