Get the Windows directory of your OS 
Private Declare Function GetWindowsDirectory Lib "kernel32" Alias "GetWindowsDirectoryA" (ByVal lpBuffer As String, ByVal nSize As Long) As Long 
Private Sub Form_Load() 
Dim a As String * 256 
GetWindowsDirectory a, 256 
MsgBox Left(a, InStr(a, Chr(0)) - 1) 
End 
End Sub