PsGetVersion

if (majorVersion == 5 && minorVersion == 2)
  {
  DbgPrint("win2003");
  }
  else if (majorVersion == 5 && minorVersion == 1)
  {
  DbgPrint("winXP");
  }
  else if (majorVersion == 5 && minorVersion == 0)
  {
  DbgPrint("win2000");
  }
  else if(majorVersion == 6 && minorVersion ==0) //VISTA

从vista开始取NtBuildNumber就可以知道是什么系统和sp了
vista 6000 sp1 6001 sp2 6002 win7 7600

OsMajorVersion = 6  OsMinorVersion =0 VISTA
OsMajorVersion = 6  OsMinorVersion =1 win7