vagrantでvagrant upするとssh keyあたりでタイムアウトが起こる

お世話になります。
vagrantでlaravelの環境を作ろうと思い、
Homesteadを使おうと思っているんですが、

homestead-7: SSH auth method: private key
Timed out while waiting for the machine to boot. This means that
Vagrant was unable to communicate with the guest machine within
the configured ("config.vm.boot_timeout" value) time period.

この部分で止まってしまいます。
原因を調べると、
sshの鍵の場所の参照位置が違うという記事と
vagrant upで失敗する原因が鍵不一致の場合の対処法
64bitOSの仮想化支援機能が有効になっていなからという二つの原因が今のところ考えられます。
VagrantとVirtualBoxでの仮想環境構築(Windows版)
BIOSの設定を見ると、disableになってもいない（それ以前にそれ以外のboxではvagrant upが出来ている）ので、ssh鍵の不一致が問題の可能性が高いと思うんですが、そこの対処がいまいちわかりません。
ちなみに、ssh-configをすると

IdentityFile C:/Users/ユーザー名/.vagrant.d/insecure_private_key

となっております。
もし、お分かりの方がいらっしゃれば回答よろしくお願いいたします。
下記にエラー部分を記載させていただきます。

Bringing machine 'homestead-7' up with 'virtualbox' provider...
==> homestead-7: Importing base box 'laravel/homestead'...
==> homestead-7: Matching MAC address for NAT networking...
==> homestead-7: Checking if box 'laravel/homestead' is up to date...
A VirtualBox machine with the name 'homestead-7' already exists.
Please use another name or delete the machine with the existing
name, and try again.

C:\Users\ohs60275\job\Homestead>vagrant up
Bringing machine 'homestead-7' up with 'virtualbox' provider...
==> homestead-7: Checking if box 'laravel/homestead' is up to date...
==> homestead-7: Setting the name of the VM: homestead-7
==> homestead-7: Clearing any previously set network interfaces...
==> homestead-7: Preparing network interfaces based on configuration...
    homestead-7: Adapter 1: nat
    homestead-7: Adapter 2: hostonly
==> homestead-7: Forwarding ports...
    homestead-7: 80 (guest) => 8000 (host) (adapter 1)
    homestead-7: 443 (guest) => 44300 (host) (adapter 1)
    homestead-7: 3306 (guest) => 33060 (host) (adapter 1)
    homestead-7: 5432 (guest) => 54320 (host) (adapter 1)
    homestead-7: 8025 (guest) => 8025 (host) (adapter 1)
    homestead-7: 27017 (guest) => 27017 (host) (adapter 1)
    homestead-7: 22 (guest) => 2222 (host) (adapter 1)
==> homestead-7: Running 'pre-boot' VM customizations...
==> homestead-7: Booting VM...
==> homestead-7: Waiting for machine to boot. This may take a few minutes...
    homestead-7: SSH address: 127.0.0.1:2222
    homestead-7: SSH username: vagrant
    homestead-7: SSH auth method: private key
Timed out while waiting for the machine to boot. This means that
Vagrant was unable to communicate with the guest machine within
the configured ("config.vm.boot_timeout" value) time period.

If you look above, you should be able to see the error(s) that
Vagrant had when attempting to connect to the machine. These errors
are usually good hints as to what may be wrong.

If you're using a custom box, make sure that networking is properly
working and you're able to connect to the machine. It is a common
problem that networking isn't setup properly in these boxes.
Verify that authentication configurations are also setup properly,
as well.

If the box appears to be booting properly, you may want to increase
the timeout ("config.vm.boot_timeout") value.

下記がHomestead.ymlの中身です。

Homestead.yml
1---
2ip: "192.168.50.10"
3memory: 2048
4cpus: 1
5provider: virtualbox
6
7authorize: ~/.ssh/id_rsa.pub
8
9keys:
10    - ~/.ssh/id_rsa
11
12folders:
13    - map: ~/job
14      to: /home/vagrant/Code
15
16sites:
17    - map: homestead.app
18      to: /home/vagrant/Code/public
19
20databases:
21    - homestead
22
23# blackfire:
24#     - id: foo
25#       token: bar
26#       client-id: foo
27#       client-token: bar
28
29# ports:
30#     - send: 50000
31#       to: 5000
32#     - send: 7777
33#       to: 777
34#       protocol: udp
35

一応、Vagrantfileも載せておきます。

# -*- mode: ruby -*-
# vi: set ft=ruby :

require 'json'
require 'yaml'

VAGRANTFILE_API_VERSION ||= "2"
confDir = $confDir ||= File.expand_path(File.dirname(__FILE__))

homesteadYamlPath = confDir + "/Homestead.yaml"
homesteadJsonPath = confDir + "/Homestead.json"
afterScriptPath = confDir + "/after.sh"
aliasesPath = confDir + "/aliases"

require File.expand_path(File.dirname(__FILE__) + '/scripts/homestead.rb')

Vagrant.require_version '>= 1.9.0'

Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
    if File.exist? aliasesPath then
        config.vm.provision "file", source: aliasesPath, destination: "/tmp/bash_aliases"
        config.vm.provision "shell" do |s|
            s.inline = "awk '{ sub(\"\r$\", \"\"); print }' /tmp/bash_aliases > /home/vagrant/.bash_aliases"
        end
    end

    if File.exist? homesteadYamlPath then
        settings = YAML::load(File.read(homesteadYamlPath))
    elsif File.exist? homesteadJsonPath then
        settings = JSON.parse(File.read(homesteadJsonPath))
    else
        abort "Homestead settings file not found in #{confDir}"
    end

    Homestead.configure(config, settings)

    if File.exist? afterScriptPath then
        config.vm.provision "shell", path: afterScriptPath, privileged: false
    end

    if defined? VagrantPlugins::HostsUpdater
        config.hostsupdater.aliases = settings['sites'].map { |site| site['map'] }
    end
end