//获取系统信息
System.OperatingSystem osInfo = System.Environment.OSVersion;
//获取操作系统ID
System.PlatformID platformID = osInfo.Platform;
//获取主版本号
int versionMajor = osInfo.Version.Major;
//获取副版本号
int versionMinor = osInfo.Version.Minor;
详细出处参考:http://www.jb51.net/article/37075.htm