Factory resetting means you will put your pc back to the condition you bought it, without your personal documents. You could transfer your documents onto an external hdd and transfer them when you are done. You could look up on youtube how to reset your pc without using a disc.

Edit 1: However, you could restore your pc to an earlier point in time if that is what you need to do.

Liability wrote Factory resetting means you will put your pc back to the condition you bought it, without your personal documents. You could transfer your documents onto an external hdd and transfer them when you are done. You could look up on youtube how to reset your pc without using a disc.

Edit 1: However, you could restore your pc to an earlier point in time if that is what you need to do.

ok i watched some videos and on my PC it says
Return your computer to factory condition
This option will delete everything on your computer and replace it with a recovery image provided by your computer manufacturer. Afterwards, you can restore your files from a backup. Any programs you've installed will need to be reinstalled using original installation discs or files.
so does that mean i need the disc for windows 7 ? I have Gateway btw

Yes, it says the Recovery Image given when you bought the computer. So...that would be the disc that came with your pc.