diff --git a/src/format.c b/src/format.c
index 4e1aee6b..5a0b25d8 100644
--- a/src/format.c
+++ b/src/format.c
@@ -1280,9 +1280,7 @@ BOOL SetupWinToGo(const char* drive_name, BOOL use_ms_efi)
 #endif
 	static char unattend_path[] = "?:\\Windows\\System32\\sysprep\\unattend.xml";
 	char *mounted_iso, *ms_efi = NULL, image[128], cmd[MAX_PATH];
-	char usb_system_dir[] = "?:\\Windows\\System32";
 	unsigned char *buffer;
-	int i;
 	wchar_t wVolumeName[] = L"?:";
 	DWORD bufsize;
 	ULONG cluster_size;
@@ -1291,7 +1289,6 @@ BOOL SetupWinToGo(const char* drive_name, BOOL use_ms_efi)
 	PF_INIT(FormatEx, Fmifs);
 
 	uprintf("Windows To Go mode selected");
-	usb_system_dir[0] = drive_name[0];
 	// Additional sanity checks
 	if ( ((use_ms_efi) && (SelectedDrive.Geometry.MediaType != FixedMedia)) ||
 		 ((nWindowsVersion < WINDOWS_8) || ((WimExtractCheck() & 4) == 0)) ) {
@@ -1353,25 +1350,21 @@ BOOL SetupWinToGo(const char* drive_name, BOOL use_ms_efi)
 			AltUnmountVolume(ms_efi);
 			return FALSE;
 		}
+		Sleep(200);
 	}
 
-	// Try the 'bcdboot' command, first using the one from the target drive and, if that doesn't work, the system's
+	// We invoke the 'bcdboot' command from the host, as the one from the drive produces problems (#558)
+	// Also, since Rufus should (usually) be running as a 32 bit app, on 64 bit systems, we need to use
+	// 'C:\Windows\Sysnative' and not 'C:\Windows\System32' to invoke bcdboot, as 'C:\Windows\System32'
+	// will get converted to 'C:\Windows\SysWOW64' behind the scenes, and ther is no bcdboot.exe there.
 	uprintf("Enabling boot...");
-	for (i = 0; i < 2; i++) {
-		static_sprintf(cmd, "%s\\bcdboot.exe %s\\Windows /f ALL /s %s",
-			(i==0)?usb_system_dir:system_dir, drive_name, (use_ms_efi)?ms_efi:drive_name);
-		if (RunCommand(cmd, NULL, TRUE) == 0)
-			break;
+	static_sprintf(cmd, "%s\\bcdboot.exe %s\\Windows /v /f ALL /s %s", sysnative_dir,
+		drive_name, (use_ms_efi)?ms_efi:drive_name);
+	if (RunCommand(cmd, sysnative_dir, TRUE) != 0) {
+		// Try to continue... but report a failure
+		uprintf("Failed to enable boot using command '%s'", cmd);
+		FormatStatus = ERROR_SEVERITY_ERROR | FAC(FACILITY_STORAGE) | APPERR(ERROR_ISO_EXTRACT);
 	}
-	if (i >= 2) {
-		// Fatal, as the UFD is unlikely to boot then
-		uprintf("Failed to enable boot - aborting", cmd);
-		FormatStatus = ERROR_SEVERITY_ERROR|FAC(FACILITY_STORAGE)|APPERR(ERROR_ISO_EXTRACT);
-		if (use_ms_efi) 
-			AltUnmountVolume(ms_efi);
-		return FALSE;
-	}
-	uprintf("Boot was successfully enabled using command '%s'", cmd);
 
 	if (use_ms_efi) {
 		Sleep(200);
diff --git a/src/msapi_utf8.h b/src/msapi_utf8.h
index 44a190bb..548878f7 100644
--- a/src/msapi_utf8.h
+++ b/src/msapi_utf8.h
@@ -433,6 +433,20 @@ static __inline UINT GetSystemDirectoryU(char* lpBuffer, UINT uSize)
 	return ret;
 }
 
+static __inline UINT GetSystemWindowsDirectoryU(char* lpBuffer, UINT uSize)
+{
+	UINT ret = 0, err = ERROR_INVALID_DATA;
+	walloc(lpBuffer, uSize);
+	ret = GetSystemWindowsDirectoryW(wlpBuffer, uSize);
+	err = GetLastError();
+	if ((ret != 0) && ((ret = wchar_to_utf8_no_alloc(wlpBuffer, lpBuffer, uSize)) == 0)) {
+		err = GetLastError();
+	}
+	wfree(lpBuffer);
+	SetLastError(err);
+	return ret;
+}
+
 static __inline DWORD GetTempPathU(DWORD nBufferLength, char* lpBuffer)
 {
 	DWORD ret = 0, err = ERROR_INVALID_DATA;
diff --git a/src/rufus.c b/src/rufus.c
index f5669acd..b19b681c 100644
--- a/src/rufus.c
+++ b/src/rufus.c
@@ -129,7 +129,7 @@ char lost_translators[][6] = LOST_TRANSLATORS;
 OPENED_LIBRARIES_VARS;
 HINSTANCE hMainInstance;
 HWND hMainDialog, hLangToolbar = NULL, hUpdatesDlg = NULL;
-char szFolderPath[MAX_PATH], app_dir[MAX_PATH], system_dir[MAX_PATH];
+char szFolderPath[MAX_PATH], app_dir[MAX_PATH], system_dir[MAX_PATH], sysnative_dir[MAX_PATH];
 char* image_path = NULL;
 float fScale = 1.0f;
 int default_fs;
@@ -2823,7 +2823,7 @@ int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
 		uprintf("Could not access UTF-16 args");
 	}
 
-	// Retrieve the current application directory as well as the system dir
+	// Retrieve the current application directory as well as the system & sysnative dirs
 	if (GetCurrentDirectoryU(sizeof(app_dir), app_dir) == 0) {
 		uprintf("Could not get current directory: %s", WindowsErrorString());
 		app_dir[0] = 0;
@@ -2832,6 +2832,20 @@ int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
 		uprintf("Could not get system directory: %s", WindowsErrorString());
 		safe_strcpy(system_dir, sizeof(system_dir), "C:\\Windows\\System32");
 	}
+	// Construct Sysnative ourselves as there is no GetSysnativeDirectory() call
+	// By default (64bit app running on 64 bit OS or 32 bit app running on 32 bit OS)
+	// Sysnative and System32 are the same
+	safe_strcpy(sysnative_dir, sizeof(sysnative_dir), system_dir);
+	// But if the app is 32 bit and the OS is 64 bit, Sysnative must differ from System32
+#if (!defined(_WIN64) && !defined(BUILD64)) 
+	if (is_x64()) {
+		if (GetSystemWindowsDirectoryU(sysnative_dir, sizeof(sysnative_dir)) == 0) {
+			uprintf("Could not get Windows directory: %s", WindowsErrorString());
+			safe_strcpy(sysnative_dir, sizeof(sysnative_dir), "C:\\Windows");
+		}
+		safe_strcat(sysnative_dir, sizeof(sysnative_dir), "\\Sysnative");
+	}
+#endif
 
 	// Look for a .ini file in the current app directory
 	static_sprintf(ini_path, "%s\\rufus.ini", app_dir);
diff --git a/src/rufus.h b/src/rufus.h
index 3c58d559..4b90a5ac 100644
--- a/src/rufus.h
+++ b/src/rufus.h
@@ -355,7 +355,7 @@ extern HWND hMainDialog, hLogDlg, hStatus, hDeviceList, hCapacity;
 extern HWND hPartitionScheme, hFileSystem, hClusterSize, hLabel, hBootType, hNBPasses, hLog;
 extern HWND hInfo, hProgress, hDiskID, hStatusToolbar;
 extern float fScale;
-extern char szFolderPath[MAX_PATH], app_dir[MAX_PATH], system_dir[MAX_PATH];
+extern char szFolderPath[MAX_PATH], app_dir[MAX_PATH], system_dir[MAX_PATH], sysnative_dir[MAX_PATH];
 extern char* image_path;
 extern DWORD FormatStatus, DownloadStatus;
 extern BOOL PromptOnError;
diff --git a/src/rufus.rc b/src/rufus.rc
index 356c9ccd..a7feb658 100644
--- a/src/rufus.rc
+++ b/src/rufus.rc
@@ -32,7 +32,7 @@ LANGUAGE LANG_NEUTRAL, SUBLANG_NEUTRAL
 
 IDD_DIALOG DIALOGEX 12, 12, 242, 376
 STYLE DS_SETFONT | DS_MODALFRAME | DS_CENTER | WS_MINIMIZEBOX | WS_POPUP | WS_CAPTION | WS_SYSMENU
-CAPTION "Rufus 2.3.702"
+CAPTION "Rufus 2.3.703"
 FONT 8, "Segoe UI Symbol", 400, 0, 0x0
 BEGIN
     LTEXT           "Device",IDS_DEVICE_TXT,9,6,200,8
@@ -317,8 +317,8 @@ END
 //
 
 VS_VERSION_INFO VERSIONINFO
- FILEVERSION 2,3,702,0
- PRODUCTVERSION 2,3,702,0
+ FILEVERSION 2,3,703,0
+ PRODUCTVERSION 2,3,703,0
  FILEFLAGSMASK 0x3fL
 #ifdef _DEBUG
  FILEFLAGS 0x1L
@@ -335,13 +335,13 @@ BEGIN
         BEGIN
             VALUE "CompanyName", "Akeo Consulting (http://akeo.ie)"
             VALUE "FileDescription", "Rufus"
-            VALUE "FileVersion", "2.3.702"
+            VALUE "FileVersion", "2.3.703"
             VALUE "InternalName", "Rufus"
             VALUE "LegalCopyright", "© 2011-2015 Pete Batard (GPL v3)"
             VALUE "LegalTrademarks", "http://www.gnu.org/copyleft/gpl.html"
             VALUE "OriginalFilename", "rufus.exe"
             VALUE "ProductName", "Rufus"
-            VALUE "ProductVersion", "2.3.702"
+            VALUE "ProductVersion", "2.3.703"
         END
     END
     BLOCK "VarFileInfo"
diff --git a/src/stdfn.c b/src/stdfn.c
index 6ffc2129..af86c6b2 100644
--- a/src/stdfn.c
+++ b/src/stdfn.c
@@ -544,7 +544,7 @@ DWORD RunCommand(const char* cmd, const char* dir, BOOL log)
 
 	si.cb = sizeof(si);
 	if (log) {
-		// NB: The size of a pipe is a suggestion, NOT an absolute gaurantee
+		// NB: The size of a pipe is a suggestion, NOT an absolute guarantee
 		// This means that you may get a pipe of 4K even if you requested 1K
 		if (!CreatePipe(&hOutputRead, &hOutputWrite, NULL, dwPipeSize)) {
 			ret = GetLastError();