My windows xp system locks up at start u

First you will need to trouble shoot the system to determine what is causing the system to lockup during startup

Things to try,that may be causing this to happen
Check Advanced Power Management settings
Anti-Virus configuration could be set to scan drive at start up,which could cause system lockup

Disable screen saver loading at startup

Update the video driver

When booting the system,press the designated key to enter Safe Mode and then check the Device Manager to see if their are any IRQ conflicts

When system locks up,try CTRL+ALT+DEL to get task manager window see what is not responing at startup

You may want to download the TweakUI power tool from web which is a good tool to troubleshooting problems

Did you recently install new software or new drivers for hardware? If so you may have to use the recovery console to shutdown the services at startup. Booting to safe mode would be the first thing I would try. If you can't even do that then post additional comments for further details.

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