I am generating html reports using Selenium, Python, and HTMLTestRunner. Sample test script is in the attached tarball. The test runs, and generates valid html (also in attached tarball, sel_test.py) that I can load in browser.

My jenkins workspace on the slave is c:\jenkins\workspace, and the tarball is of the directory C:\jenkins\workspace\Test_nfweb.

I see the following in the jenkins log on the master:

17:05:56.652 INFO - Command request: getNewBrowserSession[*iexplore, http://www.warmfuzzyland.com/, ] on session null
17:05:56.652 INFO - creating new remote session
17:05:56.653 INFO - Got result: Failed to start new browser session: java.lang.RuntimeException: SystemRoot apparently not set! on session null
17:05:56.672 INFO - Command request: getNewBrowserSession[*iexplore, http://www.warmfuzzyland.com/, ] on session null
17:05:56.672 INFO - creating new remote session
17:05:56.711 INFO - Got result: Failed to start new browser session: java.lang.RuntimeException: SystemRoot apparently not set! on session null
Nov 29, 2011 5:05:56 PM hudson.model.Run run
INFO: Test_nfweb #29 main build action completed: FAILURE
Nov 29, 2011 5:05:56 PM hudson.model.AbstractBuild$AbstractRunner performAllBuildSteps
WARNING: Publisher org.jvnet.hudson.plugins.seleniumhtmlreport.SeleniumHtmlReportPublisher aborted due to exception
java.lang.NullPointerException
at org.jvnet.hudson.plugins.seleniumhtmlreport.SeleniumHtmlReportPublisher.perform(SeleniumHtmlReportPublisher.java:79)
at hudson.tasks.BuildStepMonitor$3.perform(BuildStepMonitor.java:36)
at hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:692)
at hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:667)
at hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:645)
at hudson.model.Build$RunnerImpl.post2(Build.java:162)
at hudson.model.AbstractBuild$AbstractRunner.post(AbstractBuild.java:614)
at hudson.model.Run.run(Run.java:1429)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:238)

Where else can I look?