Should work

KeyPresser.ps1

@@ -1,20 +1,27 @@
 #region Header
 
+    $Version = "1.0.0"
+
     #Dependencies
-    [Reflection.Assembly]::LoadWithPartialName("System.Windows/Forms") | Out-Null
+    [Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms") | Out-Null
     Add-Type -AssemblyName System.Windows.Forms
     Add-Type -AssemblyName PresentationFramework
 
 
     #Hide Console Window
     Add-Type -Name Window -Namespace Console -MemberDefinition '
-    [DllImport("Kernal32.dll")]
+    [DllImport("Kernel32.dll")]
     public static extern IntPtr GetConsoleWindow();
 
     [DllImport("user32.dll")]
     public static extern bool ShowWindow(IntPtr hWnd, Int32 nCmdShow);
     '
 
+    $consolePtr = [Console.Window]::GetConsoleWindow()
+    [Console.Window]::ShowWindow($consolePtr, 0) > $null
+
+
+
     #Talking across runspaces
     $Sync = [Hashtable]::Synchronized(@{})
 
@@ -27,29 +34,17 @@
 
         $script = [Powershell]::Create().AddScript({
             Param ($Keys)
-
-                $sleep = ".5"
-                while($X -eq $null){
-                    sleep $sleep
-                    [System.Windows.Forms.SendKeys]::SendWait("{4}")
-                    sleep $sleep
-                    [System.Windows.Forms.SendKeys]::SendWait("{3}")
-                    sleep $sleep
-                    [System.Windows.Forms.SendKeys]::SendWait("{2}")
-                    sleep $sleep
-                    [System.Windows.Forms.SendKeys]::SendWait("{3}")
-                    sleep $sleep
-                    [System.Windows.Forms.SendKeys]::SendWait("{1}")
-                    sleep $sleep
-                    [System.Windows.Forms.SendKeys]::SendWait("{3}")
-                    sleep $sleep
-                    [System.Windows.Forms.SendKeys]::SendWait("{5}")
-                    sleep $sleep
-                    [System.Windows.Forms.SendKeys]::SendWait("{3}")
+               
+                while($sync["x"] -eq 1){
+                    $keys = $keys -split ","
+                    Foreach ($key in $keys){
+                        Start-Sleep -Milliseconds 500
+                        [System.Windows.Forms.SendKeys]::SendWait("{$key}")
+                    }
                 }
         }).AddArgument($Keys)
 
-        $runsapce = [RunspaceFactory]::CreateRunspace()
+        $runspace = [RunspaceFactory]::CreateRunspace()
         $runspace.ApartmentState = "STA"
         $runspace.Threadoptions = "ReuseThread"
         $runspace.open()
@@ -65,12 +60,42 @@
 #region Form
 
     $form = New-Object System.Windows.Forms.Form
-    $form.text = "Keypresser"
-    $Form.Size = "500,500"
+    $form.text = "Keypresser Version $Version"
+    $Form.Size = "450,110"
+    $Form.FormBorderStyle = 'FixedDialog' 
+    $form.TopMost = $True
     $Form.Add_FormClosing({Get-Process -id $pid | Stop-Process})
 
+    $KeysLabel = New-Object 'System.Windows.Forms.Label'
+    $KeysLabel.text = "Enter in the keys you wish to be pressed seperated by a comma `",`""
+    $KeysLabel.Width = '425'
+    $KeysLabel.Location = New-Object System.Drawing.Point(5,5)
+    $form.controls.add($KeysLabel)
 
+    $KeysTextBox = New-Object 'System.Windows.Forms.TextBox'
+    $KeysTextBox.Location = New-Object System.Drawing.Point(5,25)
+    $KeysTextBox.Width = '425'
+    $form.controls.add($KeysTextBox)
 
+    $KeysButton = New-Object 'System.Windows.Forms.Button'
+    $KeysButton.Location = New-Object System.Drawing.Point(5,45)
+    $KeysButton.text = "Start"
+    $KeysButton.add_click({
 
+        if ($KeysButton.text -ne "Stop"){
+            $KeysButton.text = "Stop"
+            $sync["x"] = 1
+            $Keys = $KeysTextBox.text
+            Keypress $Keys
+        }
+        Else{
+            $KeysButton.text = "Start"
+            $sync["x"] = 0
+        }
 
-#endregion Form
+    })
+    $form.controls.add($KeysButton)
+
+#endregion Form
+
+[Windows.Forms.Application]::Run($form)