Laptop won't boot after installing Win 10

I really have gotten myself into a bind here. Yesterday, I went to install Win 10 on an old laptop that I use for just browsing the web, and the kid uses to do homework, and sometimes play Starcraft. I had Win 7 Pro 32-bit installed on it. The installation went fine but then I realized that I had used a 64-bit ISO when I should have used the 32-bit version. This was a problem only because there were no 64-bit graphics drivers for the laptop.

So, I went back to do a clean install using the 32-bit ISO. Once the installation began, and the system started preparing the files, I stepped away for a few minutes. When I got back, the copying of the files was complete and the laptop had initiated its first reboot into Windows Setup. Except, the screen was frozen on the splash screen that precedes loading of the BIOS.

I did a manual reboot. This time, it got past the splash screen and into BIOS, but it then froze just after it posted the USB and hard drive info, all of which showed OK. It froze immediately after posting HDD information. I couldn't go into BIOS setup, nor could I boot from the Installation USB.

This morning, I removed the hard drive and stuck it into one of the external docks connected to my desktop.Opened up Disk Management. It shows the 3 partitions: System Reserved, the OS partition (and the installation), and the Data Drive, all showing "Healthy." On the laptop, with the HDD removed, I was able to F2 into BIOS, and boot off of the Installation USB, no problem.

SO I am wondering if there are some diagnostics/repairs I can perform on the drive and the OS white I have access to it from the dock. Any thoughts, please? Thank you.

P.S. CHKDSK found nothing btw. The laptop is a ASUS V1Jp lol. Yeah, it's as old as the hills.