Without going into too much detail, just for starters, I have to comment --
You can't "brick" a PC. PCs use standard hard drives which are replaceable. "Bricking" is when you interrupt or do a bad job flashing the BIOS (the very lowest level of software in a device -- and the ONLY level of OS or operating software for many consumer electronics devices) so that the old low-level instructions are gone BUT ALSO the new version that you were upgrading to as well. So you have neither the old or the new, and you turn on the device and it has no low-level BIOS software to execute -- so you have a brick. Unless you can replace the flash ROM chip on the motherboard (which may require soldering) you are out of luck.
You can *always* format a PC and install a new operating system. Even if you destroyed a hard drive, you just buy a new one.
I meant "brick" in the sense of "it's useless to me and I can't do a software fix on it". I see from your comments that this is not the standard definition, and perhaps I shouldn't have used the term so loosely. I can surf some very basic internet on it, but anything that is the least bit complicated, can't do it. I have neither the time nor the patience to try to download all the things I might need, and even then be in no better shape than when I started. I have tried to reformat it, and it doesn't work. Don't know what I'm doing wrong. It may be something simple.
I have actually thought of getting a new hard drive and just starting from scratch. This is a piece-of-dung cheapest Compaq imaginable, it doesn't even have built-in WiFi, I have to use a USB device for that --- whose bright idea was that in the year circa 2010? I actually have a couple of hard drives from PCs that died on me --- when I have to retire a computer, I take it apart and throw every usable part into a storage box, in case I might ever find a use for it. So I may see if either of those are compatible.
I also have a fairly nice HP that I bought in 2006, and I have repurposed it to an entertainment server, to play audio and video through the TV set in our main room. I have basically rebuilt that machine from scratch due to hardware failures, new motherboard, new hard drive, new video card, you name it, and taking into account its inherent limitations, it's actually the smoothest, most trouble-free, most elegant PC I own. Playing MP3 and MP4 through Windows Media Player isn't exactly nuclear physics.
If I can't fix the Compaq, I may just donate it to charity. I have several machines here that aren't regularly used. Planned obsolescence has seen to that.