If you have access to a backup image, then use it. You would need to start though using your OS disc. You gave no clue to what's what other than Dell PC.
Mount your Dell install disc(you have one?) and assuring from your bios area that the CD drive is the 1st boot device(check, change and save upon exit). -OR- upon booting from Dell and have hit F8 key until the safe mode, etc. menu appears select "repair option" if so present. If not then the install disc should have it. Once booted, it provide a menu to reload a "saved image" or restore to an earlier. the restore feature is MS process that you select a restore date prior to the problem. One way or another you should be able to correct the boot process. You can google for all these process and Dell even provides generic info as well.
Next, you power problems. I strongly suggest you fix them. A surge protector is a simple device and it maybe already defeated. It's protection is already gone, replace with better one. get yourself a UPS, to better isolate power issues and hopefully have time to do a proper shutdown. You should consider that the AC powerline for that computer have a electrician replace the ckt. bkr. with a surge rated one directly at panel. -OR- allow an electrician to inspect and suggest better options for that AC powerline to the computer area. In other words make that AC line a computer one.
FYI- I use a strip surge protector, individual AC surge protector per cord, line conditioner and AC wall(plug-in) surge protector. In most cases, any surge protector has LED to show its active, if they go out, the protection is gone.
All any protection can do in the long run is reduce damage or give the option to shutdown(UPS).
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