vladgothe and Topographer,
It seems that you don't have luck with version of ACAD... I've tested on my machines and the oldest version I am using is A2008 on 32 bit system, and it works fine... Guess, you both should update your hardware and software... The newest version of ACAD can be found on www and it's A2014... Just remember that during installation avoid to download service pack, for you won't be able to activate it correctly...
M.R.