Shuts down on boot up - E-Machines T5212 PC Desktop

Maybe something is defective from the factory? Can you bring it back and exchange it for another? Is it a desktop or a laptop? If it's a desktop, maybe remove a side panel and aim a small fan at the inside. Do you know how to start up your computer in safe mode? Maybe try starting it in safe mode and see if you can do a system restore, do you know what that is and how to do it? Google will explain it to you, but I'd suggest those steps.

Shuts down when? Right after you boot it up? Or does it run a while then shut down?
If it shuts down after it has run for a while then the computer is probably running hot. Either the CPU Fan is not working or the Thermal Paste has dried up or is too thin to keep the CPU Cool. To prove it is running hot, let the computer sit for a while then boot it up. Once it boots up use it until it shuts down and immediately try to boot it up. If it does not boot up that means it's running hot. But if you let it cool off then try booting up you will be successful.

Your use of "and" is confusing. F8 is not used during the shut down process; it is used during the boot up process. Since you mention F8, it is presumed that you want to use F8 to get into "Safe Mode" instead. When you re-boot a running computer, very often you will not be able to use F8, but if you totally shut down, then start from scratch, you should be able to hold the F8 key down and it intercept the boot up process to handle things properly. Don't worry if you hear a lot of beeps during the boot up process with the key pressed; it merely means the keyboard buffer is receiving more key presses than it has room for. Since they all are F8, when the boot up process looks at the characters from the keyboard, it will see the F8 key, then display the menu options to boot into Safe Mode.

Sounds like a Windows issue. Depending on how valuable it is to you to get your data off the drive, I would suggest buying a new hard drive (they are fairly cheap these days), installing Windows on that. Word of advice: Remove your old drive when doing the Windows install, so as not to accidentally select the hard drive your data is on. Once you have Windows installed, shut down your computer, remove the power cord, and install your old drive on a separate IDE channel or SATA connection. If your PC still tries to boot to the old drive, change the boot order in your PC's BIOS.

blow out dirts on bord, then you pack the board to avoid any bridging with the cassing

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Sameera

may be due to internal boot failur or malius software

Sounds like at the very least, the hard drive is. This is common when a file required by the OS is corrupted, and the OS tries to not damage data so it restarts or shuts down.

when i turn the player on it says warning boot error shutting down and then it shuts down.

You may have let a magnet get near the mp3 player. Go to "My Computer" Then double click on the Mp3 player. You will see "Internal Storage" Icon. Right click it and click format. You will lose all data on the device. Also upgrading to 3.003 does not fix the Boot error problem.