Minecraft texture packs should not have any viruses in them. I have never heard of anyone getting a virus from a texture pack, so you should be all set.
It is unlikely, and also anyone can just register a Minecraft account themselves.
Anyone can make one.
Anyone can register a free Minecraft account on the Minecraft website.
no
Anyone can.
Anyone can have one.
Anyone can make a Minecraft account at Minecraft.net
Probably a mod, but I haven't heard of it.
You must register your account to play Minecraft, however, anyone can download Minecraft.
No.
I doubt anyone is running one anymore, seeing as we are in V.1.2.3 of Minecraft.