把启动窗体先显示出来，然后，过一段时间再把这个窗体隐藏起来就行了。在其他窗体中加一句form1.visible=false
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然后启动窗体把标题栏什么的设置一下，做个图片背景什么的，就行了。
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim aa As Integer = Val(TextBox1.Text)
Dim i As Integer
For i = 2 To aa
If aa Mod i = 0 Then
TextBox2.Text += i.ToString + " "
aa = aa / i
i = 2
End If
Next
End Sub
Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
TextBox1.Text = ss()
TextBox2.Text = ss()
End Sub
Function ss()
Randomize()
Dim a As Integer = Int(Rnd() * 100)
Return a
End Function
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
If Val(TextBox1.Text) + Val(TextBox2.Text) = Val(TextBox3.Text) Then
i += 1
Label3.Text = "正确"
Else
j += 1
Label3.Text = "错误"
End If
aa += 1
End Sub
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
TextBox1.Text = ss()
TextBox2.Text = ss()
TextBox3.Text = ""
Label3.Text = ""
End Sub
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
TextBox4.Text = "你已经答了" + aa.ToString + "题，答对" + i.ToString + "题，" + "答错" + j.ToString + "题。"
End Sub
可以先把外层的目录新建出来，代码如下：
Dim path As String
path = "c:\text\text\txt\text1.txt"
System.IO.Directory.CreateDirectory(path.Substring(0, InStrRev(path, "\"))) '建立path这个路径的所有所需目录
System.IO.File.WriteAllText(path, "牛年快乐", System.Text.Encoding.Default)
预先准备三个图标文件，用于树型控件中显示磁盘符号和文件夹的图像之用。
1、窗体上添加控件如下：
组合框控件 ComboBox1，树型控件 TreeView1，列表框控件 ListBox1，图像列表控件 ImageList1。
选中TreeView1，设置其ImageList属性为ImageList1。
2、设置属性
选中图像列表控件 ImageList1，在属性窗口里，选中属性Images，单击三个小点按钮，出现图像集合编辑器窗口，单击[添加按钮]，一一把准备好的图标文件进行添加，注意先后次序，如果不符合要求可以通过上下移动按钮重新改变次序。完成后单击[确定]。
运行图如下：
完整代码如下：
Imports System.IO
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'添加系统所有磁盘目录符号
For Each MyDrive As String In Environment.GetLogicalDrives()
ComboBox1.Items.Add(MyDrive)
Next
'显示第一个磁盘符号
ComboBox1.Text = ComboBox1.Items(0)
End Sub
'递归过程添加目录树
Public Sub AddDirectory(ByVal strFatherPath As String, ByVal strPath As String, ByVal nodeFather As TreeNode)
Dim i As Integer
Dim Mynode As New TreeNode
'先添加本目录
Mynode.Text = Strings.Replace(strPath, strFatherPath "\", "", , 1)
'为节点指定未被选中时显示的图标
Mynode.ImageIndex = 1
'为节点指定被选中时显示的图标
Mynode.SelectedImageIndex = 2
nodeFather.Nodes.Add(Mynode)
Application.DoEvents()
Try
Dim str() As String = Directory.GetDirectories(strPath)
'递归遍历该目录的子文件夹
For i = 0 To str.GetUpperBound(0)
AddDirectory(strPath, str(i), Mynode)
Next
Catch ex As Exception
Debug.WriteLine(ex.Message)
End Try
Mynode = Nothing
End Sub
'根据给出的盘符添加目录树
Private Sub AddRootDirectory(ByVal DiscSymbol As String)
Dim Nynode As New TreeNode
'先把磁盘盘符添加到树中
TreeView1.Nodes.Clear()
Nynode.ImageIndex = 0
Nynode.Text = DiscSymbol
Nynode.SelectedImageIndex = -1
TreeView1.Nodes.Add(Nynode)
Dim i As Integer
'获取磁盘根目录下的文件夹
Dim str() As String = Directory.GetDirectories(DiscSymbol "\")
For i = 0 To str.GetUpperBound(0)
'调用递归过程遍历该文件夹里的所有子文件夹，并添加到树型控件
AddDirectory(DiscSymbol, str(i), Nynode)
Next
Nynode = Nothing
End Sub
Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
'根据磁盘符号的变更，显示根目录里的文件
ListBox1.Items.Clear()
For Each MyFile As String In System.IO.Directory.GetFiles(ComboBox1.Text)
ListBox1.Items.Add(MyFile)
Next
'根据磁盘符号的变更，重新显示目录树
Dim DiscSymbol As String
DiscSymbol = Microsoft.VisualBasic.Left(ComboBox1.Text, Len(ComboBox1.Text) - 1)
Call AddRootDirectory(DiscSymbol)
End Sub
'递归过程根据子目录寻找上级目录名--从而构成完整的目录路径
Private Sub AllPath(ByVal ThisNode As TreeNode, ByRef MyPathName As String)
If ThisNode.Level 1 Then
'该节点层数大于1，其父节点不是磁盘根目录
MyPathName = ThisNode.Parent.Text "\" MyPathName
Dim MyNode As TreeNode = ThisNode.Parent
Call AllPath(MyNode, MyPathName)
Else
'该节点层数等于1，其父节点就是磁盘根目录
MyPathName = ComboBox1.Text MyPathName
End If
End Sub
Private Sub TreeView1_AfterSelect(ByVal sender As System.Object, ByVal e As System.Windows.Forms.TreeViewEventArgs) Handles TreeView1.AfterSelect
'为了搜索选中的节点对应目录的文件，需要组成全路径
Dim MyAllPathName As String = TreeView1.SelectedNode.Text
Dim MyNode As TreeNode = TreeView1.SelectedNode
If TreeView1.SelectedNode.Level = 0 Then
'如果选中的是根节点
MyAllPathName = ComboBox1.Text
Else
'如果选中的是非根节点，调用递归过程组成全路径
Call AllPath(MyNode, MyAllPathName)
MyAllPathName = MyAllPathName "\"
End If
'根据路径，搜索文件名并显示
ListBox1.Items.Clear()
For Each MyFile As String In System.IO.Directory.GetFiles(MyAllPathName)
ListBox1.Items.Add(MyFile)
Next
End Sub
End Class
新建一个Sub ： Main
Private Sub Main()
xxx.show 'xxx指启动窗体
'载入图片、数据库之类的
Unload xxx
{from}.show '{from}指主界面
End Sub
然后在工程-属性将"Main"作为启动对象
解决方案资源管理器中右键菜单，添加，WINDOWS窗体，弹出的对话框中，左栏已安装的模板中选择WINDOWS FORMS ，右边中找到 登录窗体。添加 。程序会添加一个登录界面。很方便。你试下。