Hello again Sania...Well, this is the message when I try to install "WinCC Flexible 2007" in my Windows XP Professional SERVICE PACK 3.
"The software cannot be installed on your computer with the operating system Windows XP Professional Service Pack 3, v.3311.
One of the following Microsoft operating systems has to be installed:
Windows 2000 Service Pack or higher, Windows XP Professional Service Pack 2 or higher."

My solution is uninstall Service pack 3 or I set something before installing?
I opened "Setups.ini" and this is part of the code on file.
Code:
[OS]
PlattformIDAllowed=1;2
Win95=False
Win95Exclude=0;A
Win98=False
Win98Exclude=
WinMe=False
WinNT4=False
WinNT4Exclude=0;1;2;3;4;5
Win2k=True
Win2kExclude=0;1;2;3
WinXP=True
WinXPExclude=home;0;1
WinNETServer=False "
WinXP is enabled by default...
Do you have another proposal?
What do I do with SP3 in windows Xp?
Thank you for trying to help me