diff --git a/indra/cmake/00-Common.cmake b/indra/cmake/00-Common.cmake
index 592e9fc901..a114d6e778 100644
--- a/indra/cmake/00-Common.cmake
+++ b/indra/cmake/00-Common.cmake
@@ -74,6 +74,10 @@ if (WINDOWS)
   if (NOT VS_DISABLE_FATAL_WARNINGS)
     add_definitions(/WX)
   endif (NOT VS_DISABLE_FATAL_WARNINGS)
+
+  # configure win32 API for windows XP+ compatibility
+  set(WINVER "0x0501" CACHE STRING "Win32 API Target version (see http://msdn.microsoft.com/en-us/library/aa383745%28v=VS.85%29.aspx)")
+  add_definitions("/DWINVER=${WINVER}" "/D_WIN32_WINNT=${WINVER}")
 endif (WINDOWS)
 
 
diff --git a/install.xml b/install.xml
index 39806a664d..3795fc3757 100644
--- a/install.xml
+++ b/install.xml
@@ -214,9 +214,9 @@
           <key>windows</key>
           <map>
             <key>md5sum</key>
-            <string>94fd43f534e2055858d524086384907d</string>
+            <string>72e6e2eff5d146a107f3059b6c31fb95</string>
             <key>url</key>
-            <uri>http://s3.amazonaws.com/viewer-source-downloads/install_pkgs/boost-1.39.0-windows-20100219.tar.bz2</uri>
+            <uri>http://s3.amazonaws.com/viewer-source-downloads/install_pkgs/boost-1.39.0-windows-20100630.tar.bz2</uri>
           </map>
         </map>
       </map>