Win 7 Ultimate not allowing installation citing Driver signature error  

Hi all,
I'm having a problem with driver signature enforcement on my clean install of Windows 7 Ultimate 64x on my Laptop. I had a black screen of death couple of days ago which led me to backing up all my data (by using hiren boot USB) and performing a clean Windows install via USB. Upon entering the desktop for the first time, I installed the drivers necessary for WLAN which was installed successfully and then I tried to install COMODO Free Firewall. Halfway through, warnings about no digital signatures being present popped up but the installation completed nonetheless. It required a restart which I allowed but another warning saying Comodo Firewall couldn't successfully start showed up https://i.imgur.com/OhTcOKC.jpg and even Comodo's own diagnostic tool was unable to fix the program https://i.imgur.com/DImznbj.jpg.

Since I used Comodo Firewall for the longest time and I really needed a firewall before anything else, I decided to perform another reinstall of windows, this time with Home Premium 64x. Same problem as before. I decided to try Zonealarm firewall instead and that didn't work either https://i.imgur.com/YFopa2P.jpg. I should also mention that I also used the bcdedit command lines in both OS's but no intended results.

I decided to use Windows 7 ultimate 64x OEM which was the version I was on when the Black-SOD happened and also assumed I would not have this problem since I was on this OS previously until the reinstall last week. Surprisingly, even this version which didn't throw up any signature errors in the last two years since I've used it suddenly brings the same error as the Ultimate and Home Premium. And now, I'm out of options to try.

A little about my hardware, I'm on a Acer 5750g, 8GB RAM( previously 4GB until I upgraded in early October). It intially came preinstalled with Home Premium 64x but a BSOD forced me to perform a clean install to the OEM version I mentioned above. If you're wondering why I didn't use the in-built function ACER provided to re-install or fix windows, it's because whenever I try to bring that function up (by pressing ALT + F10 during boot up), it shows this error https://i.imgur.com/BkBC0wm.jpg which I assume means it's corrupted somehow which led me to downloading an OS image file online and using it instead.

I would appreciate any help in this matter. Scoured the internet and tried all the solutions I could. The issue isn't just about the firewall but I'm worried it could show up with any other software I try to install.
I'll be happy to provide any other details if required.

PS- I downloaded the installer files for both Comodo and ZoneAlarm from the official websites

I got it from getmyos.com

IIRC two firewalls running at once will cause conflicts. Did you disable the built-in Windows FW before trying to install Comodo or Zone?

I used to use 3rd party FWs (comodo and zone alarm both at different times for years), then learned they typically collect personal data of everywhere you go online, and have ambiguous privacy policies. Also learned (in this very forum) that the built-in Windows FW is quite good and doesn't collect telemetry like 3rd parties. It's also very flexible and easy to use, to set up your own rules related to particular programs you want to block from the W/LAN.

So I uninstalled Comodo and began using the Windows FW many years back now, and it's great. Computer boots faster and the FW does a fantastic job.

My advice FWIW is, use the built-in FW and use Sandboxie for browsing, and uninstall all AVs. That's what I've been doing for many years now with great results and no infections or resource overhead.