Question

I have a VB.Net program running on vista that says a file is in use but the same program on XP does not have that error.

Answer 1

Make sure you wrap disposable resources in Using statement to ensure they are properly released:

Using conn As New SqlConnection("Data Source=.\SQLEXPRESS;AttachDbFilename=c:\BAAW\Data\BAAW.mdf;Integrated Security=True;User Instance=True")
Using cmd As conn.CreateCommand()
    conn.Open()
    cmd.CommandText = "SELECT * FROM Employees"
    Using rdr As SqlDataReader = cmd.ExecuteReader()
        While rdr.Read()
            Console.WriteLine(rdr(0))
        End While
    End Using
End Using
End Using