Well its been doing this since 1.0 came out so not sure but semi-annoying. Might have to re- install windows but I will not just for this issue so I guess I am stuck doing this until I find a solution or re do winders.
No virus that I know of I can log on to minecraft.net but I have to turn the internet off to start minecraft then turn it back on to sign in then I can play.
I have no other issues with any game from skyrim to realm of the mad god. Minecraft is the only game being odd.
I can get you a cheap website through my company I do websites for a living and have tons of room on my server. Would be glad to hook up a fellow minecrafter.