DAO constant crash and texture flickers

Hi,

I'm playing DAO on a relatively new computer, so launching it for the first time (though I had it installed for months now). I created a new character and from the very beginning I had horrible texture flicker, entire scenes that had the lighting completely bugged, squares of blood underneath corpses like it's a texture tile, and if I keep playing with the textures doing that, it eventually crashes. A couple of times, those crashes rendered the last save file corrupted. Sometimes when I start, everything is well for a pretty long time, until a random loading screen and suddenly everything is flickering again. Now I'm completely stuck, I just finished everything in the Korcari Wilds so my last save is right before activating the broken Wardens chest where Morrigan first appears. I go through the whole conversation, then same with Flemeth, and when she sends you back to Ostagar it triggers a loading screen. And without fail the last ten times I tried, the game CTD during the loading of Ostagar or right as Ostagar starts to appear. I tried lowering texture quality or enabling compatibility for Windows 7 or 8, lowering screen refresh from 144 to 60, but I'm out of ideas. I want to play so bad but this is a nightmare. And for context, on my previous computer that had very similar specs, I never had any of these issues. The only issue I had was with texture not loading properly on characters' clothes or armour (leaving them just blurry and undefined) and simply lowering texture quality from High to Medium had fixed it and I played through 5 entire playthroughs of Origins without a single issue. Can anyone help?