Does this PC have?

1. Make and model?
2. Does it use a factory restore option or media?
3. Are you asking how to perform a factory restore?
4. And did you dive in and try?

I find many owners want a picture manual showing what will happen as they boot the restore media. I rarely see that. For most you put in disk 1 and reboot the machine then click OK or press enter a lot. I think folk need to try this.