Message:
SimPE will shutdown due to an unhandled Exception.

SimPE Version:
Default (0.73.44.37511).

Exception Stack:
System.ArgumentException: Font 'Arial' does not support style 'Regular'.
  at System.Drawing.Font.CreateNativeFont()
  at System.Drawing.Font.Initialize(FontFamily family, Single emSize, FontStyle style, GraphicsUnit unit, Byte gdiCharSet, Boolean gdiVerticalFont)
  at System.Drawing.Font.Initialize(String familyName, Single emSize, FontStyle style, GraphicsUnit unit, Byte gdiCharSet, Boolean gdiVerticalFont)
  at System.Drawing.Font..ctor(String familyName, Single emSize, FontStyle style)
  at Ambertation.Windows.Forms.BaseFontTable..ctor()
  at Ambertation.Windows.Forms.WhidbeyRenderer..ctor()
  at SimPe.MainForm.InitializeComponent()
  at SimPe.MainForm..ctor()
  at SimPe.MainForm.Main(String[] args)

Source:
System.Drawing

Execution Stack:
at System.Drawing.Font.CreateNativeFont()
  at System.Drawing.Font.Initialize(FontFamily family, Single emSize, FontStyle style, GraphicsUnit unit, Byte gdiCharSet, Boolean gdiVerticalFont)
  at System.Drawing.Font.Initialize(String familyName, Single emSize, FontStyle style, GraphicsUnit unit, Byte gdiCharSet, Boolean gdiVerticalFont)
  at System.Drawing.Font..ctor(String familyName, Single emSize, FontStyle style)
  at Ambertation.Windows.Forms.BaseFontTable..ctor()
  at Ambertation.Windows.Forms.WhidbeyRenderer..ctor()
  at SimPe.MainForm.InitializeComponent()
  at SimPe.MainForm..ctor()
  at SimPe.MainForm.Main(String[] args)

Windows Version:
Vista

.NET Version:
2.0.50727.4952

I have also tried a later version and that does not work either, and doesn't give full error message

It WAS working ok a couple of weeks ago.

Thanks Kim