You've got a target on your back
I've found similar in the logs of the PC the kids use at home, and that one has two firewalls, a NAT (network address translation) router, antivirus software and a spyware scanner. I worry about family members (often running an old version of Windows that hasn't been updated in a while) who know nothing about any of this and are probably wondering why their new cable connection is so slow. Perhaps because their PC is now a zombie, used to forward porn spam or phish from the Russian mafia? I'm not being too paranoid.
I'm beginning to think that Windows should be left to the experts now. Use a Mac, or Linux if you can get someone to set it up for you. You'll be a lot safer. But if you insist on, or have to use Windows, at least switch to a browser and e-mail program that isn't as much of a target.