|You don't see a problem with your pc shutting down????|
Sounds like you have a hardware issue. Overheating or nic failure would be my guess. This would also explain your dhcp issue if the nic is going out. Or it can be related to your pc being infected which is why I pointed you to routine maintenance.
I would add that getting the message you do, I would suspect you are infected. Dhcp negociation happens when you boot up and NEVER EVER happens when you are up and running midstream.