Oracle VM Manager won't startup after VmBoxService

[Deleu]

I tried the VBoxService software and apparently it didn't work. I was trying to start it using the following tutorial.
Since I didn't care much for it, I decided to try to learn what the problem was some other time. So I uninstalled the service and rebooted my computer. After that, the Oracle VirtualBox Manage app (the one with the GUI that lists all my virtual machines) won't start up. It shows up in my Task Manager, if I try to open again it duplicates in the Task Manager. After some wait (about 2 minutes), a screen shows up with the following error:

Callee RC:
CO_E_SERVER_EXEC_FAILURE (0x80080005)

I noticed that if I execute it as admin (right-click and run as admin), it will open normally, but no machine will show up.

The only additional information that I can provide is that when installing the VBoxService app, I misunderstood the .VirtualBox folder with the VirtualBox installation folder, meaning that at first trial, I set the VBOX_HOME to C:\Program Files\Oracle\VirtualBox\. After noticing that it didn't work, I corrected it and it still didn't work, then I gave up on the app and realized that my VIrtualBox stopped working.

Installer: VirtualBox-4.2.4-81684-Win.exe

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Edit: I can't post URLs containing the images I planned to post about the Tutorial, so I'm going to paste the tutorial here:

Installation

1 - Install Oracle VirtualBox and configure your guest machine.
(to know how you can configure your guest machine click here ).
While setting up your machines Make sure you enable the Remote Display setting from the display settings tab.
2 - Setup all your guest OS’s as needed (install applications, setup preferences, etc.).
3 - Shutdown all your guest OS’s.
4 - Install VBoxVmService.
5 - Go to the installation folder for the VBoxVmService and edit the file VBoxVmService.ini.
6 - In the .ini file you will find this[Settings]
VBOX_USER_HOME=C:\Users\PROFILE_NAME\.VirtualBox
RunWebService=no
PauseShutdown=5000[Vm0]
VmName=MY_FIRST_VIRTUAL_MACHINE_NAME
ShutdownMethod=savestate
AutoStart=yes
[Vm1]
VmName=MY_SECOND_VIRTUAL_MACHINE_NAME
ShutdownMethod=savestate
AutoStart=yes
7 - Change the value of VBOX_USER_HOME to point to the location you have the .VirtualBox folder.
8 - Change the value of the VmName in each Vm block to match your virtual machine name.
9 - Each Vm block represents one virtual machine while you can add a maximum of 127 blocks to run under the same service.
10 - Save the file and reboot your system.

Taken from bashardbissi dot com.