BlueInstaller v0.3 (Bugged)

--Name: BlueInstaller
--Version: v0.3
--Author: BlueZero (AKA Stevenmcl)
--Platform: ComputerCraft LUA Environment

file1 = "1"
file2 = "2"
file3 = "3"

function blueinstaller()
userinput()
  if user == file1 and fs.exist("bluelock") then
    shell.run("clear")
    print ("BlueLock OS is already installed on this computer...")
    sleep(1)
    blueinstaller()
      else
    shell.run("clear")
    print ("Installing BlueLock OS...")
    sleep(1)
    blueinstaller()
  end

  if user == file2 then
    shell.run("clear")
    print ("installing File2...")
    sleep(1)
    blueinstaller()
  end

  if user == file3 then
    shell.run("clear")
    print ("installing File3...")
    sleep(1)
    blueinstaller()
  end

  if user == "credits" then
    shell.run("clear")
    print ("BlueInstaller designed and created by BlueZero (Stevenmcl)")
    print ("Please visit; http://computercraft.net/")
    sleep(5)
    blueinstaller()
  end

  if (user == "quit" or user == "exit" or user == "stop") then
    shell.run("clear")
    print ("Goodbye.")
    sleep(2)
    shell.run("clear")
    error()
  end

  if ((user ~= file1) and (user ~= file2) and (user ~= file3) and  (user ~= "credits")) then
    shell.run("clear")
    print ("Invalid Option, please try again.")
    sleep(2)
    blueinstaller()
  end
end

function userinput()
  shell.run("clear")
  print ("BlueInstaller v0.2 running on OS Version: ", os.version())
  print ("to view credits, type 'credits'.")
  print ("To exit, type: 'quit', 'stop', or 'exit'.")
  print (" ")
  print ("Programs Available: ")
  print (" ")
  print ("BlueLock OS: 1")
  print ("File2: 2")
  print ("File3: 3")
  print (" ")
  write ("Option: ")
  user=io.read()
end

blueinstaller()