Just in case I wasn't clear enough in my previous post i provide some
extra detail here.
The exception text from clipboard is: -

System.Runtime.InteropServices.COMException was unhandled
 Message="Retrieving the COM class factory for component with CLSID
{99D296F7-11CF-11D0-8680-0020AFA095EE} failed due to the following
error: 800401f9."
 Source="Act Workbench"
 ErrorCode=-2147220999
 StackTrace:
      at Act_Workbench.Form1.button1_Click(Object sender, EventArgs e)
in C:\Documents and Settings\garym.CCLEASING\Local Settings\Application
Data\Temporary Projects\Act Workbench\Form1.cs:line 20
      at System.Windows.Forms.Control.OnClick(EventArgs e)
      at System.Windows.Forms.Button.OnClick(EventArgs e)
      at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
      at System.Windows.Forms.Control.WmMouseUp(Message& m,
MouseButtons button, Int32 clicks)
      at System.Windows.Forms.Control.WndProc(Message& m)
      at System.Windows.Forms.ButtonBase.WndProc(Message& m)
      at System.Windows.Forms.Button.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.DebuggableCallback(IntPtr
hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
      at
System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
      at
System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32
dwComponentID, Int32 reason, Int32 pvLoopData)
      at
System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32
reason, ApplicationContext context)
      at
System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32
reason, ApplicationContext context)
      at System.Windows.Forms.Application.Run(Form mainForm)
      at Act_Workbench.Program.Main() in C:\Documents and
Settings\garym.CCLEASING\Local Settings\Application Data\Temporary
Projects\Act Workbench\Program.cs:line 17
      at System.AppDomain.nExecuteAssembly(Assembly assembly, String[]
args)
      at System.AppDomain.ExecuteAssembly(String assemblyFile,
Evidence assemblySecurity, String[] args)
      at
Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
      at System.Threading.ThreadHelper.ThreadStart_Context(Object
state)
      at System.Threading.ExecutionContext.Run(ExecutionContext
executionContext, ContextCallback callback, Object state)
      at System.Threading.ThreadHelper.ThreadStart()

The executing code is:  ActOle.DATABASE database = new
ActOle.DATABASEClass();

Thankyou.