SEVERE: Error starting Database Control

I am getting following error when installing oracle 10g...on Windows XP machine..

Enterprise Manager Configuration failed due to following error


SEVERE: Error starting Database Control

oracle.sysman.emcp.EMConfig perform
CONFIG: Stack Trace:
oracle.sysman.emcp.exception.EMConfigException: Error starting Database Control
at oracle.sysman.emcp.EMDBPostConfig.performConfiguration(EMDBPostConfig.java:569)
at oracle.sysman.emcp.EMDBPostConfig.invoke(EMDBPostConfig.java:181)
at oracle.sysman.emcp.EMDBPostConfig.invoke(EMDBPostConfig.java:150)
at oracle.sysman.emcp.EMConfig.perform(EMConfig.java:155)
at oracle.sysman.assistants.util.em.EMConfiguration.run(EMConfiguration.java:430)
at java.lang.Thread.run(Thread.java:534)

Could anyone let me know how to come out of this error...