Windows 8 Metro does not launch, "The process started, but the activation request failed with error 'The app didn't start'."

I've been developing a metro app on my personal laptop at home for the office showroom that's going to have a slideshow and the option to request a callback/leave contact details; Most of it is done, my issue is that when I uploaded the project to Dropbox so that I could load it up on the office computer, it refuses to launch. It doesn't throw an exception, instead it displays these message boxes: This is a C# Windows 8 Metro application built upon the BasicPage template.

[TITLE]Lexar2.exe - This application could not be started[/TITLE]

[CONTENT]
This application could not be started.

Do you want to view information about this issue?

[/CONTENT]

[BUTTONS]Yes/No[/BUTTONS]




[TITLE]Microsoft Visual Studio Express 2012 for Windows 8[/TITLE]

[CONTENT]
Unable to activate Windows Store app '...!App'. The Lexar2.exe process started, but the activation request failed with error 'The app didn't start'.
[/CONTENT]

Program output:

'Lexar2.exe' (Win32): Loaded 'C:\Users\Owner\Dropbox\Programming\w8\Lexar2\Lexar2\bin\Debug\AppX\Lexar2.exe'. 
'Lexar2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\ntdll.dll'. Cannot find or open the PDB file.
'Lexar2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\mscoree.dll'. Cannot find or open the PDB file.
'Lexar2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\kernel32.dll'. Cannot find or open the PDB file.
'Lexar2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\KernelBase.dll'. Cannot find or open the PDB file.
The thread 0x5c has exited with code 0 (0x0).
'Lexar2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\advapi32.dll'. Cannot find or open the PDB file.
'Lexar2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\msvcrt.dll'. Cannot find or open the PDB file.
'Lexar2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\sechost.dll'. Cannot find or open the PDB file.
'Lexar2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\rpcrt4.dll'. Cannot find or open the PDB file.
'Lexar2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\sspicli.dll'. Cannot find or open the PDB file.
'Lexar2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\cryptbase.dll'. Cannot find or open the PDB file.
'Lexar2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\bcryptprimitives.dll'. Cannot find or open the PDB file.
'Lexar2.exe' (Win32): Loaded 'C:\Windows\Microsoft.NET\Framework\v4.0.30319\mscoreei.dll'. Cannot find or open the PDB file.
'Lexar2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\shlwapi.dll'. Cannot find or open the PDB file.
'Lexar2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\user32.dll'. Cannot find or open the PDB file.
'Lexar2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\gdi32.dll'. Cannot find or open the PDB file.
'Lexar2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\imm32.dll'. Cannot find or open the PDB file.
'Lexar2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\msctf.dll'. Cannot find or open the PDB file.
'Lexar2.exe' (Win32): Loaded 'C:\Windows\Microsoft.NET\Framework\v4.0.30319\mscoreeis.dll'. Module was built without symbols.
'Lexar2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\comctl32.dll'. Cannot find or open the PDB file.
'Lexar2.exe' (Win32): Unloaded 'C:\Windows\SysWOW64\comctl32.dll'
'Lexar2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\uxtheme.dll'. Cannot find or open the PDB file.
'Lexar2.exe' (Win32): Loaded 'C:\Program Files (x86)\Common Files\Microsoft Shared\Ink\tiptsf.dll'. Cannot find or open the PDB file.
'Lexar2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\combase.dll'. Cannot find or open the PDB file.
'Lexar2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\oleaut32.dll'. Cannot find or open the PDB file.
'Lexar2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\dwmapi.dll'. Cannot find or open the PDB file.
'Lexar2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\ole32.dll'. Cannot find or open the PDB file.
'Lexar2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\oleacc.dll'. Cannot find or open the PDB file.
'Lexar2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\shell32.dll'. Cannot find or open the PDB file.
'Lexar2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\SHCore.dll'. Cannot find or open the PDB file.
'Lexar2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\propsys.dll'. Cannot find or open the PDB file.
'Lexar2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\apphelp.dll'. Cannot find or open the PDB file.
'Lexar2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\ieframe.dll'. Cannot find or open the PDB file.
'Lexar2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\iertutil.dll'. Cannot find or open the PDB file.
'Lexar2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\comctl32.dll'. Cannot find or open the PDB file.
'Lexar2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\comctl32.dll'. Cannot find or open the PDB file.
'Lexar2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\comctl32.dll'. Cannot find or open the PDB file.
'Lexar2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\comctl32.dll'. Cannot find or open the PDB file.
'Lexar2.exe' (Win32): Unloaded 'C:\Windows\SysWOW64\comctl32.dll'
'Lexar2.exe' (Win32): Unloaded 'C:\Windows\SysWOW64\comctl32.dll'
'Lexar2.exe' (Win32): Unloaded 'C:\Windows\SysWOW64\comctl32.dll'
'Lexar2.exe' (Win32): Unloaded 'C:\Windows\SysWOW64\comctl32.dll'
'Lexar2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\urlmon.dll'. Cannot find or open the PDB file.
'Lexar2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\wininet.dll'. Cannot find or open the PDB file.
'Lexar2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\twinapi.dll'. Cannot find or open the PDB file.
'Lexar2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\cryptsp.dll'. Cannot find or open the PDB file.
'Lexar2.exe' (Win32): Loaded 'C:\Windows\SysWOW64\rsaenh.dll'. Cannot find or open the PDB file.
The thread 0x189c has exited with code -2146232576 (0x80131700).
The thread 0x19f8 has exited with code -2146232576 (0x80131700).
The thread 0x1370 has exited with code -2146232576 (0x80131700).
The thread 0x10ec has exited with code -2146232576 (0x80131700).
The program '[6224] Lexar2.exe' has exited with code -2146232576 (0x80131700).

I can't think of anything else that would need to be added other than system specs so please tell me if I'm leaving something out:

Windows 8 x64
6GB Ram
Intel(R) Pentium(R) CPU G2020 2.9Ghz

Edit: I am able to create a new project and launch that without issues, and the app I'm working on now was originally created on this computer and uploaded to dropbox, where I downloaded it on my personal laptop and worked on it overnight than re-uploaded it.

This has the answer for you: http://msdn.microsoft.com/en-us/library/vstudio/ms241613.aspx

Alternatively, when you publish your project in Visual Studio from the Project > Store > Create App Packages menu, you get the APPX together with a PowerShell script for the installation. Make sure you have a dev license on the target machine before installing.