Emax

Hello Group(again)

 I greatly appreciate everyones help on the replacement drive for my 
EMAX SE but my next question(request)how can i find out which O.S. I 
have, and is there any one who can send me the disk to upgrade my 
current O.S.?????also from my reading earlier I believe I need 2 disk
1 to erase the current O.S. and the 2nd to replace the O.S. is that 
correct?????

Once again MANY MANY THANX PPL