Espero te ayude este codigo:
Código:
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
For i As Integer = 1 To 10
chkList1.Items.Add("Elemento" & i.ToString)
Next
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
For i As Integer = 0 To chkList1.Items.Count - 1
If chkList1.GetItemChecked(i) = True Then
chkList1.SetItemChecked(i, False)
End If
Next
End Sub
Buena suerte...