Getting window handle when user clicks inside it

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VB

Hello,

I have a global mouse hook. When the user left-clicks inside a window (can be any application), I want to get this window's handle and move it. I have the following functions that I use to move the window and get the window at the mouse coordinates:

<DllImport("user32.dll", SetLastError:=True)> _
Public Shared Function SetWindowPos(ByVal hWnd As IntPtr, ByVal hWndInsertAfter As IntPtr, ByVal X As Integer, ByVal Y As Integer, ByVal cx As Integer, ByVal cy As Integer, ByVal uFlags As UInt32) As Boolean
End Function

<DllImport("user32.dll", EntryPoint:="WindowFromPoint", CharSet:=CharSet.Auto, ExactSpelling:=True)> _
Public Shared Function WindowFromPoint(ByVal pt As Point) As IntPtr
End Function

Here is where the program detects the left-clicks:

Public Sub MouseMoved(ByVal sender As Object, ByVal e As MouseEventArgs)
    If (e.Clicks > 0 AndAlso e.Button = Windows.Forms.MouseButtons.Left) Then
        SetWindowPos(WindowFromPoint(New Point(Cursor.Position.X, Cursor.Position.Y)), New IntPtr(-1), 200, 200, SomeWidth, SomeHeight, 0)
    End If
End Sub

This should move the window to coordinates 200, 200 and resize it to SomeWidth/SomeHeight (whatever those are).

Currently, it works as desired if I click in the title bar or the window's edge (resize cursor appears), but it does not work if the user clicks inside the window - ie. the user clicks inside an IE window in the control where the pages load. Clicking anywhere but on the title bar or window edge returns a different handle than the window handle, and so the window is not moved. How can I get the window's handle no matter where the user clicks inside this window?

Thanks.