"Not allowed to modify system or printer defined size (A2). Only user defined paper size can be modified or deleted."

Hi, have Acrobat XI standard edition in Windows 8.1 PRO 64 bits and Autocad LT 2015 64 bits, Acrobat does not allow me to create the size A2 but if I could create the sizes A1 and A0.

It's important to note that when I used Windows 7 Pro 64-bit, I had no problems generating paper sizes.

I appreciate your help in advance.

Thank you