[antisocial]

Thanks for those tips!

[oh8eleven]

You're welcome and there's something else to consider. Do you use a router?
Sometimes the bug, virus, malware, whatever, can take control of your router and no matter what AV you run on your PC, it won't resolve the problem.
If you do have a router, reset it manually by pressing the reset button on the back. It's usually recessed so you may need a tool.
Then run your router software and reset the password from the default (which is usually "admin").