Internet access with Proxy Server unchecked??

Hello,

I was on the internet yesterday morning, it was running strangely, then I suddenly could not get back on. I called my internet provider, and they said I needed to disable my anti-virus temporarily to determine the problem. Webroot does not provide this option when the icon is right clicked so she gave me a phone number to call for "Webroot Tech Support".

Long story short, it wasn't actually Webroot tech, she had me uncheck the Proxy Server so I could get on the internet and she could scan my computer. Three infections were found but whatever company it was wanted $170 to take them off.

I did a Malwarebyte scan today and deleted three infections, my problem now is that I cannot access the internet with the Proxy Server being checked so I am even more vulnerable to viruses.

What do I need to do to be able to re-check the Proxy Server? Please HELP!!!