If you Set Form's Border Property to None and Forms WindowState to Maximized then Taskbar Will be Hidden....
Here's a Solution Try and Comment your Experience
If you Need Taskbar and No Border to Your Form Just Change WindowsState to Normal and use This Code
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Me.Top = 0
Me.Left = 0
Me.Height = Screen.PrimaryScreen.WorkingArea.Height
Me.Width = Screen.PrimaryScreen.WorkingArea.Width
End Sub
Happy Coding......