diff --git a/Makefile.am b/Makefile.am
index 243166b3f..98e3fef05 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -6,7 +6,7 @@ GZIP_ENV="-9n"
 
 BITCOIND_BIN=$(top_builddir)/src/bitcoind$(EXEEXT)
 BITCOIN_QT_BIN=$(top_builddir)/src/qt/bitcoin-qt$(EXEEXT)
-BITCOIN_WIN_INSTALLER=$(PACKAGE)-$(PACKAGE_VERSION)-win32-setup$(EXEEXT)
+BITCOIN_WIN_INSTALLER=$(PACKAGE)-$(PACKAGE_VERSION)-win$(WINDOWS_BITS)-setup$(EXEEXT)
 
 OSX_APP=Bitcoin-Qt.app
 OSX_DMG=Bitcoin-Qt.dmg
diff --git a/configure.ac b/configure.ac
index 973f4398d..d4ca3b1c2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -193,6 +193,12 @@ case $host in
      if test "x$CXXFLAGS_overridden" = "xno"; then
        CXXFLAGS="$CXXFLAGS -w"
      fi
+     case $host in
+       i?86-*) WINDOWS_BITS=32 ;;
+       x86_64-*) WINDOWS_BITS=64 ;;
+       *) AC_MSG_ERROR("Could not determine win32/win64 for installer") ;;
+     esac
+     AC_SUBST(WINDOWS_BITS)
      ;;
   *darwin*)
      TARGET_OS=darwin
diff --git a/share/setup.nsi.in b/share/setup.nsi.in
index dd3786238..d29d95715 100644
--- a/share/setup.nsi.in
+++ b/share/setup.nsi.in
@@ -1,4 +1,4 @@
-Name @PACKAGE_NAME@
+Name "@PACKAGE_NAME@ (@WINDOWS_BITS@-bit)"
 
 RequestExecutionLevel highest
 SetCompressor /SOLID lzma
@@ -6,7 +6,7 @@ SetCompressor /SOLID lzma
 # General Symbol Definitions
 !define REGKEY "SOFTWARE\$(^Name)"
 !define VERSION @CLIENT_VERSION_MAJOR@.@CLIENT_VERSION_MINOR@.@CLIENT_VERSION_REVISION@
-!define COMPANY "Bitcoin project"
+!define COMPANY "Bitcoin Core project"
 !define URL http://www.bitcoin.org/
 
 # MUI Symbol Definitions
@@ -28,6 +28,9 @@ SetCompressor /SOLID lzma
 # Included files
 !include Sections.nsh
 !include MUI2.nsh
+!if "@WINDOWS_BITS@" == "64"
+!include x64.nsh
+!endif
 
 # Variables
 Var StartMenuGroup
@@ -45,14 +48,18 @@ Var StartMenuGroup
 !insertmacro MUI_LANGUAGE English
 
 # Installer attributes
-OutFile @abs_top_srcdir@/bitcoin-${VERSION}-win32-setup.exe
+OutFile @abs_top_srcdir@/bitcoin-${VERSION}-win@WINDOWS_BITS@-setup.exe
+!if "@WINDOWS_BITS@" == "64"
+InstallDir $PROGRAMFILES64\Bitcoin
+!else
 InstallDir $PROGRAMFILES\Bitcoin
+!endif
 CRCCheck on
 XPStyle on
 BrandingText " "
 ShowInstDetails show
 VIProductVersion ${VERSION}.@CLIENT_VERSION_BUILD@
-VIAddVersionKey ProductName Bitcoin
+VIAddVersionKey ProductName "Bitcoin Core"
 VIAddVersionKey ProductVersion "${VERSION}"
 VIAddVersionKey CompanyName "${COMPANY}"
 VIAddVersionKey CompanyWebsite "${URL}"
@@ -152,6 +159,15 @@ SectionEnd
 # Installer functions
 Function .onInit
     InitPluginsDir
+!if "@WINDOWS_BITS@" == "64"
+    ${If} ${RunningX64}
+      ; disable registry redirection (enable access to 64-bit portion of registry)
+      SetRegView 64
+    ${Else}
+      MessageBox MB_OK|MB_ICONSTOP "Cannot install 64-bit version on a 32-bit system."
+      Abort
+    ${EndIf}
+!endif
 FunctionEnd
 
 # Uninstaller functions