Getting the IP and hack the PC is a dead case here. We all are using Q-Tel public IP addresses and it keeps on changing. Hacking his PC Trough his PC will result in hacking half if not most of Doha's computers.

Just don't reply, the e-mail can have an attachment that would be a back-door that will open your PC to everyone, or would establish a connection with the remote server or pc that will hack yours.