Need to restore computer to factory condition

I was trying to run an update on my computer & got caught in a loop. I couldn't even log off. I had to turn it off with the buttons. Now I can't even get to the log in screen. I had this problem once before & someone told me how to get to a screen where I had the option to restore it to factory condition. Can anyone tell me how to do this? I don't know alot about computers ... obviously.

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Need to restore computer to factory condition

what OS are you running?

see if you can boot it and get to the bios and set it to boot from CD. Then find a new OS (a free ubuntu would work) and reinstall. As far as getting files off of it it's tough with one HDD and one PC.

getting files

You can probably get your files saved through the live cd