Sounds like a typical corrupted update failure..
I doubt you are going to get back even through safe mode (forcefully shutting down PC most likely made the issue worse)..
You may need to FOLLOW the manufacturers instructions on starting a "repair" or complete reload by using the HP recovery process..
Not exactly sure but I think you will need to watch the HP "splash screen" from a cold boot for the correct key sequence in order to get into the HP recovery partition.
The other possibility is the HD went bad and in that case only a new drive and complete reload will fix the problem..
Couple of very wise suggestions for future updates..
TURN OFF the AUTOMATIC DOWNLOAD AND INSTALL.. Instead set it to NOTIFY when new updates are available.
Second, do not allow the PC to pull the updates via WIRELESS only allow updates to download when PHYSICALLY WIRED TO the internet through the network card, this is a very important step since wireless connections can and often FAIL and any failures, slowdown or interruption of the data can and will corrupt the update files.. (ran into this with a failing DSL modem that would happen to fail at the exact moment the Windows update was downloading)..
Once Windows starts installing the updates it can be rather hard to fix the problem update.. Sometimes it results in a harmless but annoying failed update message each time you boot to as bad as a completely corrupted OS that is unbootable.