[mso] Run Time Error 9 - Subscript out of range.

Need help on the following:
Visual Basic was working perfectly over the weekend but it now falls over 
at stage 1..

This morning I started to build a form to record names (checkbox) and 
addresses (text box). I wrote the following opening code: 

Private Sub UserForm_Initialize()

    ActiveWorkbook.Sheets("Input Sheet").Activate
 
    Range("A3").Select

With cboxClient
.AddItem "Edwards"
.AddItem "Johnson"

End With

End Sub

Tried to Run Sub/User Form to check the names appeared in the Checkbox.

'Pop-up' appeared saying:

Run Time Error 9 - Subscript out of range.

Don't understand what this means. Will I have to reinstall Windows and 
Office? 

Appreciate any feedback

Robert Allen-Turl
79 Calver Crescent
Sapcote
Leics LE9 4JD
Tel: +44 1455 272762
Fax: +44 1455 271478
Mobile: 07818 272762

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