Power Schemes problem in Windows XP

If the Power Schemes of Power Options Properties in Windows XP is set to Portable/Laptop, The system will be switched to standby state say after 20 minutes. However, this is a problem for the systems that provide the services to others, one of the example is the build system. The scheduled build tasks won't be able to start to perform the builds. Once a system could not start up scheduled tasks and stay in standby state, make sure the power schemes is not set to Portable/Laptop.