How do you know the IP is from Google HQ? Google has free Wi-Fi in Mountain View, and it seems reasonable that those IPs would be somehow connected to Google.

Then why mention that your PC can't have been compromised?

You're making a big accusation, and I want to see some more evidence. You claimed never to have downloaded anything, which is unlikely to say the least.

1. Can you provide the screenshot of installed apps?

2. Also, let's see the full ip.