That's happened to me before. Simple solution...
Control Panel > Network Connections
You should see Local Area Connection 4 & Local Area Connection 2.
Right click them, and hit repair. It works for me. (You may need to disable them first, and restart your computer after).
Sounds like you are Ip banned.
Though maybe the site is actually down!Unlikely tho
.
None that use this computer.Have any friends come over to you lately?
Contact your ISP and ask for an IP change.
If they ask why; say someone is threatening you and they have your ip address.

