WPI 4.5 on Windows 8, crashes on start everytime

Any time I run WPI 4.5 it immediately flashes ".. has stopped working".  This is a recent problem as I already used it to install a whole host of software and files previously.

I have no log, but do have the tmp file:

(modules excluded)

Dump Summary
------------
Dump File:    WERE447.tmp.mdmp : Z:\temp\WERE447.tmp.mdmp
Last Write Time:    18/05/2013 13:50:24
Process Name:    WebPlatformInstaller.exe : C:\Program Files\Microsoft\Web Platform Installer\WebPlatformInstaller.exe
Process Architecture:    x86
Exception Code:    0xE0434F4D
Exception Information:    An exception came from the CLR
Heap Information:    Not Present

System Information
------------------
OS Version:    6.2.9200
CLR Version(s):    2.0.50727.6400

Modules
-------
Module Name    Module Path    Module Version
-----------    -----------    --------------
WebPlatformInstaller.exe    C:\Program Files\Microsoft\Web Platform Installer\WebPlatformInstaller.exe    7.1.1863.0

I have tried unisrtalling, repairing reinstalling.  All to no avail.

Edit---

I managed to get a .Net Error and copied that below:

See the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
System.TypeLoadException: Method 'get_AsyncWaitHandle' in type 'ThreadMethodEntry' from assembly 'System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' does not have an implementation.
   at System.Windows.Forms.Control.MarshaledInvoke(Control caller, Delegate method, Object[] args, Boolean synchronous)
   at System.Windows.Forms.Control.BeginInvoke(Delegate method, Object[] args)
   at System.Windows.Forms.Form.OnLoad(EventArgs e)
   at System.Windows.Forms.Form.OnCreateControl()
   at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible)
   at System.Windows.Forms.Control.CreateControl()
   at System.Windows.Forms.Control.WmShowWindow(Message& m)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
   at System.Windows.Forms.ContainerControl.WndProc(Message& m)
   at System.Windows.Forms.Form.WmShowWindow(Message& m)
   at System.Windows.Forms.Form.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)


************** Loaded Assemblies **************
mscorlib
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.6400 (Win8RTMGDR.050727-6400)
    CodeBase: file:///C:/Windows/Microsoft.NET/Framework/v2.0.50727/mscorlib.dll
----------------------------------------
WebPlatformInstaller
    Assembly Version: 4.0.0.0
    Win32 Version: 7.1.1863.0
    CodeBase: file:///C:/Program%20Files/Microsoft/Web%20Platform%20Installer/WebPlatformInstaller.exe
----------------------------------------
System.Windows.Forms
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.6402 (Win8RTMGDR.050727-6400)
    CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Windows.Forms/2.0.0.0__b77a5c561934e089/System.Windows.Forms.dll
----------------------------------------
Microsoft.Web.PlatformInstaller.UI
    Assembly Version: 4.0.0.0
    Win32 Version: 7.1.1863.0
    CodeBase: file:///C:/Program%20Files/Microsoft/Web%20Platform%20Installer/Microsoft.Web.PlatformInstaller.UI.DLL
----------------------------------------
System
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.6401 (Win8RTMGDR.050727-6400)
    CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System/2.0.0.0__b77a5c561934e089/System.dll
----------------------------------------
System.Drawing
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.6401 (Win8RTMGDR.050727-6400)
    CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Drawing/2.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll
----------------------------------------
Accessibility
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.6387 (Win8RTM.050727-6300)
    CodeBase: file:///C:/Windows/assembly/GAC_MSIL/Accessibility/2.0.0.0__b03f5f7f11d50a3a/Accessibility.dll
----------------------------------------

************** JIT Debugging **************
To enable just-in-time (JIT) debugging, the .config file for this
application or computer (machine.config) must have the
jitDebugging value set in the system.windows.forms section.
The application must also be compiled with debugging
enabled.

For example:

<configuration><system.windows.forms jitDebugging="true" /></configuration>

When JIT debugging is enabled, any unhandled exception
will be sent to the JIT debugger registered on the computer
rather than be handled by this dialog box.