After I ran a full scan with Windows Defender on a Vista, it says that "No unwanted or harmful software detected. - Your computer is running normally." Does it really mean my pc is clean? I'm having problem with the internet connectivity, it drops about once an hour, this happened after I visited a site where a pop up come up with a loading bar that said virus was detected in my pc. I called the internet provider, they say my internet is fine, I change cables and wires around, the connection problem still persists. Is my pc being infected by virus? Or Can I trust the scanning result of Windows Defender? Thank you.