NTLDR is missing Windows 7 cannot even use F8

[pdryburn]

HP all-in-one circa 2012
Outlook & one tab in Chrome running
Both hung - ctrl-alt-del did not even work to let me kill them
On/off button also not working, so unplugged (hey, this has worked in the past)
Plugged in and startup gets thru HP logo then hits "NTLDR is missing - ctrl-alt-del to restart" which just does the same thing over and over again.
Esc to BIOS - ran diagnostics - all appeared okay - "R" to restart had same result
Esc to BIOS - boot menu - tried from network controller w/ same result
BIOS - system recover - same result
BIOS - UEFI app - same result
Searched online...
Unplugged removable drive & ensured no CD/DVD in that drive - went directly to network drive for boot - msgs: no boot filename received, exiting PXE ROM, no boot disk has been detected or the disk has failed (checked boot sequence and shouldn't it just move on to the next thing??)
Hit return tries network drive boot again - same result
Ctrl-alt-del tries ditto - same result
(this is about when I read that Win7 doesn't use NTLDR anymore)
Tried to use F8 per many suggestions online---it doesn't appear to be recognized at all! system goes right to the network drive boot again
Okay---so this computer came with Win7 on it - I didn't purchase Win7 for this computer or upgrade it - I have a flash drive "HP recovery media 3-9-2012" but I do not have a DVD to boot from... and I don't remember making one).
HOWEVER, for the old PC (which I'm using now) I did purchase Win7 upgrade. CAN I USE THOSE for the problem (and newer) PC????
IF SO-----------I don't remember if the HP all-in-one is 32-bit or 64-bit and the system info available to me right now does not explicitly tell me. I think it's 32-bit, but...???
***OR*** should I use the HP recover media flash drive??? What exactly does that over-write or wipe out? It's over 2 years old.
(Side note: I love the articles that tell you to be sure to have a good backup before you do this... like I can do that when the machine won't even boot... okay, done with rant.)
I would really appreciate your help today.
Thanks in advance,
--Paula in Texas

 

[boosted1g]

You can use the HP recovery media or you can even use a standard cd (not the upgrade cd) of windows 7. You can also download a stock windows cd of windows 7 from digital river. If you use a standard windows disc then you will have to manually go to hp website and download all of the drivers (most likely from a different device as you may not have internet access without the lan driver).

You should try to doa repair first to see if it can replace the missing/corupt OS files. If that fails then you will have to do a full install which will wipe out all of your data.

You can use a windows or linux boot cd to boot the computer and transfer your files before you have to wipe it. Of you can remove the hard drive and use a usb-sata adapter and plug the hard drive into another computer.

This is why having a backup hard drive is important, in your case you have a corupt OS and the data is on the hard drive; if the hard drive your data is on was bad, you would be hosed.