Annoying Warning and Reminder Messages.

Everytime I start my PC, I get this warning message stating the following:

Your computer is ready for backup.
Your window PC has free computer backup software installed.
Click OK and register your computer and start backup.

Then periodically I get this Reminder Message stating:

Your computer is not backed up.
Back up your files on line today.
Free computer backup available.
Back up now.

How can I stop this warning window. It's very annoying. I think someone is trying to sell me something.