Did you choose to wipe it all or keep files and settings?
Either way, on another PC, download this and create a Win 10 installer on DVD or USB
Win 10 media creation tool
if you chose to save files, you might want to try this and see if you can rescue them: http://www.howtogeek.com/howto/windows-vista/use-ubuntu-live-cd-to-backup-files-from-your-dead-windows-computer/
another way is move the hdd into another pc as a secondary drive and copy files off it.
Once you have your files and are ready to continue, I am going to suggest a full install. There is no way of knowing what state windows is in now, so a fresh install is the safest alternative.
Now you will need to change your BIOS boot order so the USB or DVD is first, HDD second
Insert the installer in drive and boot pc
follow this step by step guide:
http://www.tenforums.com/tutorials/1950-windows-10-clean-install.html
If this seems to complicated for you, get PC fixed by a shop. They will know how to do all this, or should.