Consistent CTDs with no error message after about 75 minutes of play

[Levviathan6]

Hi, everyone.

The CTDs mentioned in the title are completely random except for the elapsed playtime. It’s not entering or exiting a specific cell, or involving any specific mesh or texture (although it is raining a lot in-game) or NPC. There might be a slight increase in CTDs upon entering a new cell but only after at least an hour of play time and not one specific cell. I've also crashed immediately post-combat, and swimming in the river near Riverwood, and in the keep at Helgen just before the jump into the inn. It’s always an abrupt CTD, no error message, just BAM, desktop, and MO unlocks and it’s just completely harshing my immersion.

I’ve tried everything to fix it. I’ve removed most of my script mods, plus some non-scripted ones. (The modlist I’ve attached has been unchanged since my last new game.) I’ve done a clean install, I’ve tried every permutation of Skyrim, skyrimprefs, and SKSE settings, every permutation of crash fixes and memory patches, dialed my graphics down to low, bashed patches, merged patches, everything that I could think of and most of the things the internet told me to do and I’m still having this problem.

SPM indicated that the problem was memory, so I started using the memory dumping program recommended by Skyrim Project Stability (http://www.nexusmods.com/skyrim/mods/32363/), I unparked three of my cores (the load times are heckin’ now) and did pretty much everything else recommended by the skyrim mods subreddit. The problem persists. I thought it might be my graphics card shutting down due to heat, so I spent hours fiddling with the NVIDIA control panel, and I had to generate a new d3d9.dll because my computer kept defaulting to my integrated chipset so I was SURE that was the problem, but it apparently wasn’t. I can’t afford better internal cooling right now but I do have a very high powered tower fan blowing directly on the computer, and a USB powered cooling fan for under the computer. It’s actually ridiculous because I played Skyrim JUST FINE on this machine for like two years, and then I took a break of about 8 months and suddenly I’m having these terribly annoying issues.

In case someone wants to suggest I upgrade to SSE, thank you for the suggestion, but no.

Modwatch: https://modwat.ch/u/Levviathan6

Computer specs: HP ENVY 15t Quad Win 7 4th gen Intel i7-4700MQ Processor (I unparked all of the cores) NVIDIA GeForceGT 740M graphics card with 2GB memory 12GB DDR3 RAM (2 Dimm) 1TB 5400 rpm Hard Drive Computer was purchased in August 2014 and has run Skyrim just fine until now.

I appreciate so very much any help you fine people are able to provide.