I'm getting RPC error when I try to register analys32.xll in the VB program.
ErrorCode=-2147417851
  Message="El servidor lanzó una excepción. (Exception from HRESULT:
0x80010105 (RPC_E_SERVERFAULT))"
  Source="Microsoft.Office.Interop.Excel"
  StackTrace:
       at Microsoft.Office.Interop.Excel.ApplicationClass.RegisterXLL(String
Filename)
       at WindowsApplication9.Form1.Button1_Click(Object sender, EventArgs
e) in C:\Documents and Settings\ccuervo\Mis documentos\Visual Studio
2005\Projects\WindowsApplication9\WindowsApplication9\Form1.vb:line 9
       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(ApplicationContext context)
       at
Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun()
       at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApplicationModel()
       at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(String[] commandLine)
       at WindowsApplication9.My.MyApplication.Main(String[] Args) in
17d14f5c-a337-4978-8281-53493378c1071.vb:line 81
       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 code:

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click
        Dim objExcel As Microsoft.Office.Interop.Excel.Application
        objExcel = New Microsoft.Office.Interop.Excel.Application
        objExcel.Workbooks.Open(objExcel.Application.LibraryPath & _
         "\Análisis\atpvbaen.XLa")
        objExcel.RegisterXLL(objExcel.Application.LibraryPath & _
                "\Análisis\analys32.xll")
        Dim p(4) As Double
        p(0) = -4504000.0
        p(1) = 66183.78
        p(2) = 86326.67
        p(3) = 86326.67
        p(4) = 4524142.89

        Dim X As Double
        '  objExcel.AddIns.Add("c:\Analisis\atpvbaen.XLa")
        Dim d(4) As Date
        d(0) = #1/1/1998#
        d(1) = #3/1/1998#
        d(2) = #10/30/1998#
        d(3) = #2/15/1999#
        d(4) = #4/1/1999#

        Debug.Print(objExcel.Run("xIrr", p, d)) ' Result: 0.374858599901199
        'objExcel.A()
        'MsgBox(X)
        objExcel.Quit()
        objExcel = Nothing


    End Sub
Anyone of you know how to solve this problem

Something I found:
http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=201281&SiteID=1

You might have to install .NET programmability support.

.NET Serialization Quest
Sound with New System.Media.SoundPlayer()
Hiding Default Constructor in VB Express 2005 (Public Not Creatable in VB6)
Directory.Getfiles search pattern
New SQL Express 2005 ?
Is there a shortcut for class properties?
Get Product Keys
How to detect total CPU percentage utilization
Multithreaded application, thread not quiting.
How to retrieve the local admin group name?