I have a Dimension e520 and I went to restore my system and half way through restoring it it stopped and told me to call Dell Technical Support and to click Finish to reboot. 

When it rebooted it took me to a black screen and at the top there's a blue bar that say www.dell.com and below that "Loading PBR for descriptor 2...done. A disk read error occurred press ctrl+alt+del to restart" I'll restart and it'll do it again.

I'm not sure what the issue is (I'm not very tech savy I just know the basics). 

Could you please help!