Using playsound to play background music

I am currently making a frogger game for an assignment at college. I decided to put some background music into the game and used the following code:

Public Class SoundClass
Declare Auto Function PlaySound Lib "winmm.dll" (ByVal Name _
As String, ByVal hmod As Integer, ByVal flags As Integer) As Integer
' name specifies the sound file when the SND_FILENAME flag is set.
' hmod specifies an executable file handle.
' hmod must be Nothing if the SND_RESOURCE flag is not set.
' flags specifies which flags are set.

' The PlaySound documentation lists all valid flags.
Public Const SND_SYNC = &H0 ' play synchronously
Public Const SND_ASYNC = &H1 ' play asynchronously
Public Const SND_FILENAME = &H20000 ' name is file name
Public Const SND_RESOURCE = &H40004 ' name is resource name or atom

Public Sub PlaySoundFile(ByVal filename As String)
' Plays a sound from filename.
PlaySound(filename, Nothing, SND_SYNC)
End Sub
End Class

in the form_load procedure

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim SoundInst As New SoundClass()
SoundInst.PlaySoundFile("\frogger.wav")
End Sub

The only problem is that when I go to run the code I get the following error:

An unhandled exception of type 'System.Security.SecurityException' occurred in Frogger.exe

Additional information: System.Security.Permissions.SecurityPermission

Hope I haven't been too confusing, I have tried looking on google but can't seem to find anything to help.

Thanks in advance for any help. Dan