Hey everyone, I'm new to this community and if I'm posting in the wrong section I hope I'll be forgiven and informed as to which section I should've posted in...

Anyway, a couple of months ago I purchased an XPS 8900 desktop (core i7, 6th Gen., 16GB DDR4, Windows 10 Pro x64) from Amazon. Refurb. Since then, I added 16 more GB RAM, an EVGA 1050Ti GPU, and upgraded the wifi to this one. I've been pleased with it except for one issue: Trying to run Windows 7 on this thing.

I always make the necessary changes in BIOS that are required (enabling Legacy ROMS, making sure Secure Boot is off) and I use this image and tutorial for my install. From usb with Rufus, just like the tutorial instructs. Install goes swell, Windows 7 Pro gets installed fine, activation is automatic, I get my updates from Microsoft and also the Dell site here (using System Detect and Dell Update)... No problems. Until after I've spent hours setting up my computer. Then, it never fails, I go to restart, the computer freezes at the logon screen for a few minutes, it logs in to a completely black screen with only a mouse cursor, and I suddenly get a BSOD. It's usually something to do with "buffer overflow" something-or-another. Always it's something different as far as which software driver is responsible. The last time Acronis True Image's "snapman.sys" seemed to be the culprit. But like I said, sometimes it's some other thing. I don't remember them all. There have been several.

Nothing like that ever happens if I just use Windows 10 Pro, however. Everything runs as smooth as silk. I know some of you are going to say "Well, stay with 10, silly!" and I do understand that Windows 10 is the latest-and-greatest MS os. But, dang!, I wanna run Windows 7 until its end-of-life in 2020. I like Windows 7. And these days getting a machine with a Windows 7 OEM install is like trying to find a golden Easter egg in a hunt.  

I'm just wondering if there might be some other settings in my BIOS that might need to be turned off or disabled. 

My system drive is an almost new Samsung Pro SSD (256GB) and I have 2 HDDs, both 2 TB Seagates, for backups and which hold my videos, music, etc. Oh, and I always disconnect those HDD drives (plus any extra usb drives) whenever I do my Windows 7 install, so that no boot files get stashed on them from Win7 setup. 

I feel like I've done everything correct, per the score of tutorials I've read/watched on installing 7 to a Dell XPS 8900 desktop... but am I missing something? Have any of you had similar experiences and solved them? Any advice (aside from wisecracks) would be welcome. Thanks in advance!