It likely needs to be cleaned up. Do a scan disk and a defrag. Delete unused software to free up disk space. Run a virus scan and that should all help a great deal.
It slowly shuts down when dead.
question is too vague
Computers do not "seed".
And?
Usually. If it shuts your computer down, then boot into safe mode.
problem in your boot sector. boot computer with your operating system install disk and run repair install program.
A failed computer is possible, It could also be the cluster, wiring, ignition switch, etc.
turn it off and go to a computer store to get it removed before it shuts down your computer
Check that battery is connected.
A computer that shuts down and reboots on its own often has an issue with the power supply. Replacing the power supply will often resolve the problem.
Certain worms that get into your computer shut down your computer when the worm loads. One specific worm is the MSBLAST.exe and W32.Blaster... and also if you search on YouTube you can find people renaming files and creating a fake virus message which shuts down your computer.
Generally when a computer shuts itself down it's considered a side effect of having something wrong with it. The most common occurance being a virus. It would be best to run a virus scanning program, or taking the computer into a Computer Repair Store.