Try this:
Set up splash screen option on project properties to SplashScreen1 and Startup Form to what you want to open after splash screen.
Then paste the code below to your splash screen.
Private Sub SplashScreen1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Application.DoEvents()
Me.Show()
Me.Refresh()
System.Threading.Thread.Sleep(5000)
End Sub