Vista - Fileupload control nightmare

I have a simple fileupload control.....

<td>
<asp:FileUpload ID="fuData" Width="600px"
runat="server" />
</td>


code...

Dim path As String, file as String
file = "test.xls"
path = "c:\Upload\Somefolder\"
Me.fuData.PostedFile.SaveAs(path & file)

I get an error that access to c:UploadSomeFoldertest.xls was denied.
Obviosuly the saveas location is being mangled and all backslashes are
being removed. Tried replacing "\" with "\\" and it still fails with
the same error

This works just fin in my dev environment (XP Pro).. fails in
Production (Windows 2003 Server).

Using IIS 6 and code is written using framework 3.5.

Anyone have any suggestions ?

TIA