How to go back to factory settings?

Good morning, I have an old Windows XP computer and I wanted to ask how to make it go back to factory settings without the disks? It's more than 10 years old and going slow...Would really appreciate any help/advice? Thank you
 
what is the manufacturer's name, the model and the model number of the pc??

for example: Dell, Dimension, 3000

if the drive has not been wiped you can generally find a hidden partition that will restore to factory settings, just need above info so I can find your owner's manual on line. :)
 
what is the manufacturer's name, the model and the model number of the pc??

for example: Dell, Dimension, 3000

if the drive has not been wiped you can generally find a hidden partition that will restore to factory settings, just need above info so I can find your owner's manual on line. :)
It's a Dell Dimension 4550 Windows XP Home Edition
 
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