the main System requirement of the WinCC Flexible :
1.Operating system with Service pack SP:
(Compact):Windows2000 SP4 or Windows XP Professional SP1
(Recommended):Windows2000 SP4 MUI or Windows XP Professional SP1 Multilingual User Interface
2.Internet browser:
(Compact):Microsoft Internet Explorer V6.0
(Recommended):Microsoft Internet Explorer V6.0
3.Processor:
(Compact):Pentium III,800MHz
(Recommended):Pentium IV,2GHz or higher
4.Graphics board/resolution.number of colors:
(Compact):1024X768 / 256
(Recommended):1280X1024 or better / True Color
5.Main memory RAM:
(Compact):512Mbytes
(Recommended):>=512Mbytes
6.Hard disk(Free memory):
(Compact):1Gbutes and greater
(Recommended):1Gbutes and greater