VirtualDriveSet Portable 2.2

here was a really quick way i came up with it
here you go

$var = IniRead("Data\VirtualDriveSet.ini", "VirtualDriveSet", "Driveletter", "B:")
if FileExists ($var&"\") Then
	Run ("subst.exe /d "& $var)
Else
$var = "subst.exe "&$var&" \"
Run($var)
EndIf

this one will also look for the ini in the data folder
luv this program btw

Edit:
also do you really need all that code for the launcher?
here is a base you can use

;Copyright (C) 2004-2006 John T. Haller

;Website: http://PortableApps.com/PNotePortable

;This software is OSI Certified Open Source Software.
;OSI Certified is a certification mark of the Open Source Initiative.

;This program is free software; you can redistribute it and/or
;modify it under the terms of the GNU General Public License
;as published by the Free Software Foundation; either version 2
;of the License, or (at your option) any later version.

;This program is distributed in the hope that it will be useful,
;but WITHOUT ANY WARRANTY; without even the implied warranty of
;MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;GNU General Public License for more details.

;You should have received a copy of the GNU General Public License
;along with this program; if not, write to the Free Software
;Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

!define NAME "PNotesPortable"
!define FRIENDLYNAME "PNotes Portable"
!define APP "PNotes"
!define VER "1.1.0.0"
!define WEBSITE "PortableApps.com/PNotesPortable"

;=== Program Details
Name "${NAME}"
OutFile "${NAME}.exe"
Caption "${FRIENDLYNAME} | PortableApps.com"
VIProductVersion "${VER}"
VIAddVersionKey ProductName "${FRIENDLYNAME}"
VIAddVersionKey Comments "Allows ${APP} to be run from a removable drive.  For additional details, visit ${WEBSITE}"
VIAddVersionKey CompanyName "PortableApps.com (John T. Haller)"
VIAddVersionKey LegalCopyright "John T. Haller"
VIAddVersionKey FileDescription "${FRIENDLYNAME}"
VIAddVersionKey FileVersion "${VER}"
VIAddVersionKey ProductVersion "${VER}"
VIAddVersionKey InternalName "${FRIENDLYNAME}"
VIAddVersionKey LegalTrademarks "PortableApps.com is a Trademark of Rare Ideas, LLC."
VIAddVersionKey OriginalFilename "${NAME}.exe"
;VIAddVersionKey PrivateBuild ""
;VIAddVersionKey SpecialBuild ""


;=== Runtime Switches
CRCCheck On
WindowIcon Off
SilentInstall Silent
AutoCloseWindow True
RequestExecutionLevel user

;=== Program Icon
Icon "${NAME}.ico"

Var DISABLESPLASHSCREEN

Section "Main"
	
	ReadINIStr $DISABLESPLASHSCREEN "$EXEDIR\${NAME}.ini" "${NAME}" "DisableSplashScreen"

	FindProcDLL::FindProc "PNotes.exe" ;if running, exit
	StrCmp $R0 "1" TheEnd
	
	StrCmp $DISABLESPLASHSCREEN "true" SkipSplash
			;=== Show the splash screen before processing the files
			InitPluginsDir
			File /oname=$PLUGINSDIR\splash.jpg "${NAME}.jpg"
			newadvsplash::show /NOUNLOAD 1000 200 0 -1 /L $PLUGINSDIR\splash.jpg
			
	SkipSplash:	
		Exec `App\VirtualDriveSet\VirtualDriveSet.exe

	TheEnd:
		newadvsplash::wait
SectionEnd

you can change the names in the beginning.

If Not FileExists("Data\VirtualDriveSet.ini") Then
	IniWrite ("Data\VirtualDriveSet.ini", "VirtualDriveSet", "Driveletter", "X:")
EndIf

OR

;=== Program Icon
Icon "${NAME}.ico"

Var DISABLESPLASHSCREEN

Section "Main"
	
	ReadINIStr $DISABLESPLASHSCREEN "$EXEDIR\${NAME}.ini" "${NAME}" "DisableSplashScreen"

	FindProcDLL::FindProc "PNotes.exe" ;if running, exit
	StrCmp $R0 "1" TheEnd

IfFileExists Data\VirtualDriveSet.ini Continue createIni
CreateIni:
		CopyFiles App\DefaultData\VirtualDriveSet.ini Data\VirtualDriveSet.ini
Continue:

	StrCmp $DISABLESPLASHSCREEN "true" SkipSplash
			;=== Show the splash screen before processing the files
			InitPluginsDir
			File /oname=$PLUGINSDIR\splash.jpg "${NAME}.jpg"
			newadvsplash::show /NOUNLOAD 1000 200 0 -1 /L $PLUGINSDIR\splash.jpg
			
	SkipSplash:	
		Exec `App\VirtualDriveSet\VirtualDriveSet.exe`

	TheEnd:
		newadvsplash::wait
SectionEnd