HelpME! v.1.5.0 has been submitted.

HelpME! v.1.5.0 has been submitted today on the Windows Phone Marketplace.
This version fix a bug that closes the app when the user returns to the main page, after the choice of an option.
Steps to Reproduce:
1. Launch the application. Dismiss the dialog.
2. Select any option from the Application Bar.
3. Press the device Back button.
4. Observe the application closes instead of returning to the previous page or return to any previous page within the back stack.

How to install Windows Phone SDK on Windows XP

Download the Windows Phone SDK from Microsoft Download Center
Extract the downloaded package by running in a command prompt

vm_web.exe /x

Go to the folder of the extracted package and open the file baseline.dat with text editor
Look at [gencomp7788] section and change two entries in this way:

InstallOnLHS=0
InstallOnWinXP=0

Save the file baseline.dat and run 

setup.exe /web

Enjoy

Error 2738. Could not access VBScript run time for custom action.

Cause

This error message indicates that the VBScript engine is not currently registered on the machine where the install/uninstall is taking place.

Resolution

The VBScript engine can be quickly registered by following these steps:

Run Command Prompt as administrator:
Start Menu -> All Programs -> Accessories
Right click on Command Prompt and select Run as administrator

If you are using 32-bit version of Windows type:

cd %windir%\system32

into the Command Prompt and hit Enter

If you are using 64-bit version of Windows type:

cd %windir%\syswow64

into the Command Prompt and hit Enter, then for both 32/64 bit type 

regsvr32 vbscript.dll

into the Command Prompt and hit Enter.