diff --git a/makepanda/installer.nsi b/makepanda/installer.nsi
index e0b838c48f..c2d9c68c3e 100755
--- a/makepanda/installer.nsi
+++ b/makepanda/installer.nsi
@@ -136,7 +136,7 @@ SectionGroup "Panda3D Libraries"
         File "${BUILT}\LICENSE"
         File /r /x CVS "${BUILT}\ReleaseNotes"
         SetOutPath $INSTDIR\bin
-        File /r /x libpandagl.dll /x libpandadx9.dll /x cgD3D*.dll /x python*.dll /x libpandaode.dll /x libp3fmod_audio.dll /x fmodex*.dll /x libp3ffmpeg.dll /x av*.dll /x postproc*.dll /x swscale*.dll /x swresample*.dll /x libp3rocket.dll /x boost_python*.dll /x Rocket*.dll /x _rocket*.pyd /x libpandabullet.dll /x OpenAL32.dll /x *_oal.dll /x libp3openal_audio.dll "${BUILT}\bin\*.dll"
+        File /r /x libpandagl.dll /x libpandadx9.dll /x cgD3D*.dll /x python*.dll /x libpandaode.dll /x libp3fmod_audio.dll /x fmodex*.dll /x libp3ffmpeg.dll /x av*.dll /x postproc*.dll /x swscale*.dll /x swresample*.dll /x NxCharacter*.dll /x cudart*.dll /x PhysX*.dll /x libpandaphysx.dll /x libp3rocket.dll /x boost_python*.dll /x Rocket*.dll /x _rocket*.pyd /x libpandabullet.dll /x OpenAL32.dll /x *_oal.dll /x libp3openal_audio.dll "${BUILT}\bin\*.dll"
         File /nonfatal /r "${BUILT}\bin\Microsoft.*.manifest"
         SetOutPath $INSTDIR\etc
         File /r "${BUILT}\etc\*"
@@ -223,6 +223,18 @@ SectionGroup "Panda3D Libraries"
     SectionEnd
     !endif
 
+    !ifdef HAVE_PHYSX
+    Section "PhysX support" SecPhysX
+        SectionIn 1
+
+        SetOutPath "$INSTDIR\bin"
+        File "${BUILT}\bin\libpandaphysx.dll"
+        File /nonfatal /r "${BUILT}\bin\PhysX*.dll"
+        File /nonfatal /r "${BUILT}\bin\NxCharacter*.dll"
+        File /nonfatal /r "${BUILT}\bin\cudart*.dll"
+    SectionEnd
+    !endif
+
     !ifdef HAVE_ROCKET
     Section "libRocket GUI" SecRocket
         SectionIn 1
@@ -315,26 +327,26 @@ SectionGroup "Python support"
         SetOutPath $INSTDIR\Pmw
         File /r /x CVS "${BUILT}\Pmw\*"
 
-        ; Check for a user installation of Python.
-        ReadRegStr $0 HKCU "Software\Python\PythonCore\${PYVER}\InstallPath" ""
-        StrCmp $0 "$INSTDIR\python" CheckSystemWidePython 0
-        StrCmp $0 "" CheckSystemWidePython 0
-        IfFileExists "$0\ppython.exe" CheckSystemWidePython 0
-        IfFileExists "$0\python.exe" AskExternalPth 0
+        !ifdef REGVIEW
+        SetRegView ${REGVIEW}
+        !endif
 
         ; Check for a system-wide Python installation.
-        CheckSystemWidePython:
+        ; We could check for a user installation of Python as well, but there
+        ; is no distinction between 64-bit and 32-bit regviews in HKCU, so we
+        ; can't guess whether it might be a compatible version.
         ReadRegStr $0 HKLM "Software\Python\PythonCore\${PYVER}\InstallPath" ""
         StrCmp $0 "$INSTDIR\python" SkipExternalPth 0
         StrCmp $0 "" SkipExternalPth 0
         IfFileExists "$0\ppython.exe" SkipExternalPth 0
-        IfFileExists "$0\python.exe" AskExternalPth SkipExternalPth
+        IfFileExists "$0\python.exe" 0 SkipExternalPth
 
-        AskExternalPth:
+        ; We're pretty sure this Python build is of the right architecture.
         MessageBox MB_YESNO|MB_ICONQUESTION \
-            "Your system already has a ${REGVIEW}-bit copy of Python ${PYVER} installed in:$\r$\n$0$\r$\nWould you like to configure it to be able to use the Panda3D libraries?$\r$\nIf you choose no, you will only be able to use Panda3D's own copy of Python." \
-            IDNO SkipExternalPth
+            "Your system already has a copy of Python ${PYVER} installed in:$\r$\n$0$\r$\nWould you like to configure it to be able to use the Panda3D libraries?$\r$\nIf you choose no, you will only be able to use Panda3D's own copy of Python." \
+            IDYES WriteExternalPth IDNO SkipExternalPth
 
+        WriteExternalPth:
         FileOpen $1 "$0\Lib\site-packages\panda.pth" w
         FileWrite $1 "$INSTDIR$\r$\n"
         FileWrite $1 "$INSTDIR\bin$\r$\n"
@@ -384,7 +396,7 @@ SectionGroup "Python support"
 
         AskRegPath:
         MessageBox MB_YESNO|MB_ICONQUESTION \
-            "Your system already has a ${REGVIEW}-bit copy of Python ${PYVER} installed in:$\r$\n$0$\r$\n$\r$\nPanda3D installs its own copy of Python ${PYVER}, which will install alongside your existing copy.  Would you like to make Panda's copy the default Python for your user account?" \
+            "You already have a copy of Python ${PYVER} installed in:$\r$\n$0$\r$\n$\r$\nPanda3D installs its own copy of Python ${PYVER}, which will install alongside your existing copy.  Would you like to make Panda's copy the default Python for your user account?" \
             IDNO SkipRegPath
 
         RegPath:
@@ -408,6 +420,10 @@ Function ConfirmPythonSelection
     IntOp $R1 $R1 & ${SF_SELECTED}
     StrCmp $R1 ${SF_SELECTED} 0 SkipCheck
 
+    !ifdef REGVIEW
+    SetRegView ${REGVIEW}
+    !endif
+
     ; Check for a user installation of Python.
     ReadRegStr $0 HKCU "Software\Python\PythonCore\${PYVER}\InstallPath" ""
     StrCmp $0 "$INSTDIR\python" CheckSystemWidePython 0
@@ -427,7 +443,7 @@ Function ConfirmPythonSelection
     ; of a different Panda3D build.)  Ask the user if he's sure about this.
     AskConfirmation:
     MessageBox MB_YESNO|MB_ICONQUESTION \
-        "You do not appear to have a ${REGVIEW}-bit version of Python ${PYVER} installed that is compatible with Panda3D.  Are you sure you don't want Panda to install a compatible copy of Python?$\r$\n$\r$\nIf you choose Yes, you will not be able to do Python development with Panda3D until you install a ${REGVIEW}-bit version of Python ${PYVER} and manually configure it to be able to use Panda3D." \
+        "You do not appear to have a ${REGVIEW}-bit version of Python ${PYVER} installed.  Are you sure you don't want Panda to install a compatible copy of Python?$\r$\n$\r$\nIf you choose Yes, you will not be able to do Python development with Panda3D until you install a ${REGVIEW}-bit version of Python ${PYVER} and manually configure it to be able to use Panda3D." \
         IDYES SkipCheck
 
     ; User clicked no, so re-enable the select box and abort.
diff --git a/makepanda/makepanda.py b/makepanda/makepanda.py
index f112cdbaf9..98576159df 100755
--- a/makepanda/makepanda.py
+++ b/makepanda/makepanda.py
@@ -152,7 +152,7 @@ def usage(problem):
     print("")
     print("  --nothing         (disable every third-party lib)")
     print("  --everything      (enable every third-party lib)")
-    print("  --directx-sdk=X   (specify version of DX9 SDK to use: jun2010, aug2009, mar2009, aug2006)")
+    print("  --directx-sdk=X   (specify version of DirectX SDK to use: jun2010, aug2009, mar2009, aug2006)")
     print("  --platform-sdk=X  (specify MSPlatSdk to use: win71, win61, win60A, winserver2003r2)")
     print("  --use-icl         (experimental setting to use an intel compiler instead of MSVC on Windows)")
     print("")
@@ -509,7 +509,7 @@ if (COMPILER == "MSVC"):
 
             LibName(pkg, 'd3dVNUM.lib'.replace("VNUM", vnum))
             LibName(pkg, 'd3dxVNUM.lib'.replace("VNUM", vnum))
-            if (vnum=="9" and "GENERIC_DXERR_LIBRARY" in SDK):
+            if int(vnum) >= 9 and "GENERIC_DXERR_LIBRARY" in SDK:
                 LibName(pkg, 'dxerr.lib')
             else:
                 LibName(pkg, 'dxerrVNUM.lib'.replace("VNUM", vnum))
diff --git a/makepanda/makepandacore.py b/makepanda/makepandacore.py
index 9097948e98..3cea7ba1d8 100644
--- a/makepanda/makepandacore.py
+++ b/makepanda/makepandacore.py
@@ -2065,7 +2065,7 @@ def SdkLocateAndroid():
 ########################################################################
 
 def SdkAutoDisableDirectX():
-    for ver in ["DX9", "DIRECTCAM"]:
+    for ver in DXVERSIONS + ["DIRECTCAM"]:
         if (PkgSkip(ver)==0):
             if (ver not in SDK):
                 if (GetHost() == "windows"):