In the FMS logs you see the following error:
2013-05-21 12:05:49.749 ERROR [main] com.quest.nitro.startup.FoglightServer - Failed to copy Tomcat configuration file. Forge Server cannot startup.
java.io.FileNotFoundException: C:\Quest_Software\Foglight\server\default\deploy\jboss-web.deployer\server.xml (Access is denied)
at java.io.FileOutputStream.open(Native Method)
at java.io.FileOutputStream.<init>(FileOutputStream.java:179)
at java.io.FileOutputStream.<init>(FileOutputStream.java:131)
at com.quest.nitro.startup.FoglightServer.copyFile(FoglightServer.java:212)
at com.quest.nitro.startup.FoglightServer.configTomcat(FoglightServer.java:199)
at com.quest.nitro.startup.FoglightServer.start(FoglightServer.java:299)
at org.jboss.Main.boot(Main.java:200)
at org.jboss.Main$1.run(Main.java:508)
at java.lang.Thread.run(Thread.java:662)
1) Start FMS with elevated command prompt (right click command prompt, "Run as Administrator")
2) Browse to FMS directory, and start FMS (fms -s)