Oracle 10g stop y start service

Windows XP y 7

Method # 1
Change the startup mode of Oracle Database XE Service to "Manual" from Control Panel -> Administrative Tools -> Services

Method # 2
Execute "oradim -edit -sid XE -startmode manual" from DOS command-line. Remove "" during execution.

When you're done with this, you may now MANUALLY start the database either via the GUI or from the DOS command-line in the following manner:

Startup: oradim -startup -sid XE
Shutdown: oradim -shutdown -sid XE

Should this resolve your issue, kindly mark the thread as answered.