Delete File From Reg

Hello,

i have a problem the following code saves to the registery.

Code Code:

Private Sub cmdRegister_Click()
If Len(txtRegister.Text) > 25 Then
If fnCheckRegistration(txtRegister.Text) = True Then
    fnDoRegister "SOFTWARE\ProductRecovery\PRK", txtRegister.Text
    frmMain.Show
    Unload Me
Else
    frmMessage.Show vbModal
    Registered = False
End If
Else
    frmMessage.Show
End If
End Sub

i was woundering if anyone can tell me how to delete it from the registry by clicking a command button?.