You mean from a technical stand point or blizzard banning? If it's the latter - irrelevant. Lots of ppl multibox quite a few accounts on one pc. Legit and not ban worthy. What gets ya banned is running a hard forced x86 client on an x64 capable machine.
I'd advise isboxer in case they view processes and an x86 version of xp but at this point even an x86 pc would be suspect lol. X64 became a thing in 99, it's almost 2016. Coming up on vintage, or does that make it antique? I forget the adjective/denomination.