For clipboard malware, the wallet is not the problem but the device is, as it has already been infected by the virus. The gadget should be scanned for other potential threats, and even the new device he might want to start using should be approached with caution. If it's a Windows PC, tell him to avoid pirated software, as they are most likely carriers of such malware. He or she should learn how to double-check the wallet address to ensure it matches with where they want to send payment before authorizing it, to avoid such problems from occurring in the future.