Posteriza works with all Windows versions. In detail:.
  - Windows 95 / 98 / ME
  - Windows NT / 2000 / XP / 2003

note: Árabic and other asian language only work with  Windows 2000 / XP y 2003

Any windows printer installed will work (láser, inkjet, matrix, etc.)
Any printer supported paper: A4, A3, Letter, etc.

You need to configure Windows with True Color (also called High Color or 24bits)
Recommendable with 2D hardware acceleration (almost cards have it)

For big poster a fast processor is recommended. Min.clock spped of  400MHz

 256 MB or more is recommended. (512 MB for big posters)