The plugin fails to load on jenkins startup, and is there for ignored completely. The settings are not visible in Configure Jenkins nor is the plugin listed in Installed Plugins.
jenkins.err.log contains the following:

SEVERE: Failed Loading plugin Build Failure Analyzer v1.21.0 (build-failure-analyzer)
java.io.IOException: Failed to initialize
at hudson.ClassicPluginStrategy.load(ClassicPluginStrategy.java:388)
at hudson.PluginManager$2$1$1.run(PluginManager.java:545)
at org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:169)
at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:296)
at jenkins.model.Jenkins$5.runTask(Jenkins.java:1095)
at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:214)
at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:117)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.io.IOException: Unable to read E:\JenkinsData\build-failure-analyzer.xml
at hudson.XmlFile.unmarshal(XmlFile.java:181)
at hudson.XmlFile.unmarshal(XmlFile.java:161)
at hudson.Plugin.load(Plugin.java:267)
at com.sonyericsson.jenkins.plugins.bfa.PluginImpl.start(PluginImpl.java:151)
at hudson.ClassicPluginStrategy.startPlugin(ClassicPluginStrategy.java:396)
at hudson.ClassicPluginStrategy.load(ClassicPluginStrategy.java:385)
... 9 more
Caused by: com.thoughtworks.xstream.converters.ConversionException: Expected 1 instance of hudson.diagnosis.OldDataMonitor but got 0 : Expected 1 instance of hudson.diagnosis.OldDataMonitor but got 0
---- Debugging information ----
message : Expected 1 instance of hudson.diagnosis.OldDataMonitor but got 0
cause-exception : java.lang.IllegalStateException
cause-message : Expected 1 instance of hudson.diagnosis.OldDataMonitor but got 0
class : com.sonyericsson.jenkins.plugins.bfa.PluginImpl
required-type : com.sonyericsson.jenkins.plugins.bfa.PluginImpl
converter-type : hudson.util.RobustReflectionConverter
path : /com.sonyericsson.jenkins.plugins.bfa.PluginImpl
line number : 2884
version : not available
-------------------------------
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:79)
at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:50)
at com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller.java:134)
at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.unmarshal(AbstractTreeMarshallingStrategy.java:32)
at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1189)
at hudson.util.XStream2.unmarshal(XStream2.java:161)
at hudson.util.XStream2.unmarshal(XStream2.java:132)
at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1173)
at hudson.XmlFile.unmarshal(XmlFile.java:178)
... 14 more
Caused by: java.lang.IllegalStateException: Expected 1 instance of hudson.diagnosis.OldDataMonitor but got 0
at hudson.ExtensionList.lookupSingleton(ExtensionList.java:451)
at hudson.diagnosis.OldDataMonitor.get(OldDataMonitor.java:92)
at hudson.diagnosis.OldDataMonitor.report(OldDataMonitor.java:227)
at hudson.util.RobustReflectionConverter.doUnmarshal(RobustReflectionConverter.java:369)
at hudson.util.RobustReflectionConverter.unmarshal(RobustReflectionConverter.java:268)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)
... 24 more

I am attaching the log file and build-failure-analyzer.xml