HP Touchsmart 600 bootup issues

My mother has a HP Touchsmart 600 that I upgraded from Windows 7 to Windows 10. Windows 10 works fine on there, once it finally boots up. I've noticed this scenario:

1. Power Button to turn on computer
2. BIOS Displays
3. Windows 10 logo displays
4. screen goes completely black for a couple of seconds
5. Screen comes back on, stays dark/gray and I can see my mouse pointer and it moves. The boot process hangs here for several minutes, usually and most of the time, the computer doesn't even go past this point.
6. EVENTUALLY, after several minutes, Windows 10 finally gets to the login screen, if it is going to login.

What's the reason for this, and is there a way to resolve this? I'm thinking Windows 7 even took an unusual amount of time to bootup.

Ztruker said:

Try turning off Fast Startup: Fast Startup - Turn On or Off in Windows 10 - Windows 10 Forums

Isn't Fast Startup a feature NOT available in Windows 7? I had the same problem prior to upgrading.

Could the culprit be the on screen keyboard failing to load properly?

Ztruker said:

It's a Win 10 feature, the computer is at Win 10.

WHAT is a Win 10 feature? You quoted the wrong text. I assume you meant Fast Startup is a Windows 10 feature? Actually, it looks like Fast Startup was introduced into Windows 8 and is obviously also in Windows 10, therefore was not in Windows 7. That said, I don't see how Fast Startup could be the culprit, considering I had the same problem in the Windows 7 environment.

Ztruker said:

I was just agreeing with you and quoting your text that said you upgraded to Win 10. Pretty useless post I guess, sorry.

It's cool. Don't worry about it. I MIGHT have fixed the problem without performing the arduous task of a clean install. I tried to uninstall as many HP items as possible, but there were a couple that would not budge. One thing I didn't bother trying to uninstall is a HP Webcam. I assume if I did that, Windows 10 MIGHT install its own driver. I think that's what might've happened when I uninstalled the HP Keyboard OSD, which I think actually was the culprit. I'd read somewhere that this driver/app or whatever you want to call it, was 32-bit, whereas the machine is 64-bit. Based on the number of apps that load during startup, I could almost safely assume why this was causing a problem, as I'm guessing the app couldn't address any available memory and load with ease, causing a slowdown or in most instances, a crash.