Try something like this. Add a reference to Microsoft ActiveX Data Objects 2.x Library:
Code:
Private Sub Command1_Click()
    Dim cn As New ADODB.Connection
    Dim rs As New ADODB.Recordset
    Dim i As Integer
    
    cn.Provider = "Microsoft.Jet.OLEDB.4.0"
    cn.Open "C:\MyDB.mdb", "admin", ""
    
    rs.Open "Select * From Customer Where CustomerId = YourNumber", cn, adOpenStatic
    
    If Not rs.EOF Then
        For i = 0 To rs.Fields.Count - 1
            Text1(i).Text = rs.Fields(i).Value
        Next
    End If
    
    rs.Close
    Set rs = Nothing
    cn.Close
    Set xn = Nothing
End Sub
Assuming that C:\MyDB.mdb is my database, Customer is my table and CustomerId is a criteria for my record.

Also, make sure that you have enough textboxes on the form (i.e. the number of Textboxes should match the number of fields in the table)

Regards,