It's most likely your Internet Service Provider, Rich. (or rather, the IP address it allocates to you). You could try just turning off your Modem/Router for a short while.
(If you use 'Firefox' it is always useful to purge the cache files, they look important, but they aren't really & some nasties can lurk in there. Can't say about MS IE as I dont use it).
I recently went to look at a Polish web link & it told me I was Banned

(it was a gun forum too)