This example will show you how to register and unregister ActiveX controls from Visual Basic using code, instead of
using the Regsvr32.exe.

Add 2 Command Buttons to your form. Press the first to unregister the control, and the second to register it.

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'******************* Module Code *******************
'replace the two "d:\MyDir\MyFile.OCX" below with the name of
'the OCX file you want to register or unregister
'
Public Declare Function RegControl Lib "d:\MyDir\MyFile.OCX" _
Alias "DllRegisterServer" () As Long

Public Declare Function UnRegControl Lib "d:\MyDir\MyFile.OCX" _
Alias "DllUnregisterServer" () As Long

Public Const S_OK = &H0

Sub RegisterControlSub()
On Error GoTo Err_Registration_Failed
If RegControl = S_OK Then
MsgBox "Registered Successfully"
Else
MsgBox "Not Registered"
End If
Exit Sub
Err_Registration_Failed:
MsgBox "Error: " & Err.Number & " " & Err.Description
End Sub

Sub UnRegisterControlSub()
On Error GoTo Err_Unregistration_Failed
If UnRegControl = S_OK Then
MsgBox "Unregistered Successfully"
Else
MsgBox "Not Unregistered"
End If
Exit Sub
Err_Unregistration_Failed:
MsgBox "Error: " & Err.Number & " " & Err.Description
End Sub

'**************** Form Code *******************
Private Sub Command1_Click()
UnRegisterControlSub
End Sub

Private Sub Command2_Click()
RegisterControlSub
End Sub