Fix selenium driver under windows

HTML suite exception seen:
java.lang.RuntimeException: java.lang.RuntimeException: Firefox could not be found in the path!
Please add the directory containing ''firefox.exe'' to your PATH environment
variable, or explicitly specify a path to Firefox like this:
*firefox c:\blah\firefox.exe
	at org.openqa.selenium.server.browserlaunchers.BrowserLauncherFactory.createBrowserLauncher(BrowserLauncherFactory.java:190)
	at org.openqa.selenium.server.browserlaunchers.BrowserLauncherFactory.getBrowserLauncher(BrowserLauncherFactory.java:104)
	at org.openqa.selenium.server.htmlrunner.HTMLLauncher.getBrowserLauncher(HTMLLauncher.java:79)
	at org.openqa.selenium.server.htmlrunner.HTMLLauncher.runHTMLSuite(HTMLLauncher.java:139)
	at org.openqa.selenium.server.htmlrunner.HTMLLauncher.runHTMLSuite(HTMLLauncher.java:198)
	at org.openqa.selenium.server.SeleniumServer.runHtmlSuite(SeleniumServer.java:640)
	at org.openqa.selenium.server.SeleniumServer.boot(SeleniumServer.java:305)
	at org.openqa.selenium.server.SeleniumServer.main(SeleniumServer.java:245)
	at org.openqa.grid.selenium.GridLauncher.main(GridLauncher.java:97)
Caused by: java.lang.RuntimeException: Firefox could not be found in the path!
Please add the directory containing ''firefox.exe'' to your PATH environment
variable, or explicitly specify a path to Firefox like this:
*firefox c:\blah\firefox.exe
	at org.openqa.selenium.browserlaunchers.locators.FirefoxLocator.findBrowserLocationOrFail(FirefoxLocator.java:155)
	at org.openqa.selenium.server.browserlaunchers.BrowserInstallationCache.locateBrowserInstallation(BrowserInstallationCache.java:46)
	at org.openqa.selenium.server.browserlaunchers.FirefoxChromeLauncher.<init>(FirefoxChromeLauncher.java:50)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
	at org.openqa.selenium.server.browserlaunchers.BrowserLauncherFactory.createBrowserLauncher(BrowserLauncherFactory.java:179)
	... 8 more