My netbook turns off automatically

• check wether there is any battery problem...

• Or else if netbook shows booting screen before shutting down. try safe mode log in... (mostly keep pressing "F8" key, it will show menu..)
  

Try running it on a hard flat surface and see if it runs better. The shutting down could be due to the machine overheating due to poor airflow. Try cleaning the air vents around the case, make sure they are not dusty.

What is the exact problem.

A Does it turn off automatically after few minutes Or

B It fails to shut down when you choose to do so ??

If the system turn off automatically, try to clean the cooling vents and make sure that the system is not overheating

If the system fails to shutdown, test the system in safe mode. Restart and tap F8 repeatedly, select safe mode and press Enter. Once it start in safe mode, try to shutdown. If it able to shut down properly then the problem can be with your antivirus software

keep the power button pressed for some time it would automatically shut down

go to start in windows, then click on shutdown, then restart.
If thats not possible, hold down the power button on the laptop till it shuts off, then press it again to turn it on.

We need the name of the preventing software

For rebooting your netbook. Click start and then shutdown and then restart. This will reboot your netbook. If it doesn't shuts down press and hold the power key for 5 seconds or more and it will be turned off.

go to the powermanagement in the control panel. In it check the settings to turn off system when i press, or shutdown the pc after 30 min change it to never, and turn harddisk off to never. and remove the system from hibernation

http://support.creative.com/kb/ShowArticle.aspx?sid=25966

i believe idle shutdown is the issue
Idle Shutdown: specify the duration of idle operation before it automatically shuts down. This feature helps you conserve battery power.