new-owner.ps1

$source = @"
using System;
using System.IO;
using System.Security.AccessControl;
using System.Security.Principal;

public class Program
{
    public static void Main()
    {
        WindowsIdentity currentIdentity = WindowsIdentity.GetCurrent();
        NTAccount account = (NTAccount)currentIdentity.User.Translate(typeof(NTAccount));
        ProcessDirectory(new DirectoryInfo(Environment.CurrentDirectory), account);
    }

    public static void ProcessDirectory(DirectoryInfo di, NTAccount newOwner)
    {
        foreach(DirectoryInfo dir in di.GetDirectories())
        {
            if ((dir.Attributes & FileAttributes.ReparsePoint) != FileAttributes.ReparsePoint &&
                (dir.Attributes & FileAttributes.System) != FileAttributes.System)
            {
                ChangeDirectoryOwner(dir.FullName, newOwner);
                ProcessDirectory(dir, newOwner);
            }
        }
        foreach(FileInfo file in di.GetFiles())
        {
            if ((file.Attributes & FileAttributes.ReparsePoint) != FileAttributes.ReparsePoint &&
                (file.Attributes & FileAttributes.System) != FileAttributes.System)
            {
                ChangeFileOwner(file.FullName, newOwner);
            }
        }
    }

    public static void ChangeFileOwner(string filePath, NTAccount newOwner)
    {
        FileSecurity fileSecurity = File.GetAccessControl(filePath);
        fileSecurity.SetOwner(newOwner);
        File.SetAccessControl(filePath, fileSecurity);
    }
    public static void ChangeDirectoryOwner(string directoryPath, NTAccount newOwner)
    {
        DirectorySecurity directorySecurity = Directory.GetAccessControl(directoryPath);
        directorySecurity.SetOwner(newOwner);
        Directory.SetAccessControl(directoryPath, directorySecurity);
    }
}

"@ 

# Add the C# type
Add-Type -TypeDefinition $source

# Call the static method
[Program]::Main()