Update Java Runtime Environment on Windows to 7u51.

resources/install/installers.properties

@@ -13,7 +13,7 @@ windows.jre64.file=C:\\Install\\jre-7u17-windows-x64.exe
 
 # Paths to the ZIP files of private extracted Windows JRE setups to be deployed
 # as part of the respective setups of SIP Communicator.
-windows.jre.zip=C:\\Install\\jre-7u45-windows-i586.zip
-windows.jre64.zip=C:\\Install\\jre-7u45-windows-x64.zip
+windows.jre.zip=C:\\Install\\jre-7u51-windows-i586.zip
+windows.jre64.zip=C:\\Install\\jre-7u51-windows-x64.zip
 
 #macosx.jre=${user.home}/bin/jdk1.7.0_45.jdk