Frustrated and Flickering

Hello! I've just recently begun to take the dive and fix my Sims 2 game, because like the majority of everyone else playing this game in 2020, in companionship with the *lovely* Windows 10 and just modern technology, my game was rendered completely unplayable. After around 2 days of work and a lot of help from this forum and many others, I've gotten to the point where I'm able to start the game, play it, and maneuver around inside for a good while on the highest settings my system is capable of. So that's a win!
However, along with this breakthrough, I've encountered yet another problem that I've never dealt with before and, until now, have never even seen another player have trouble with. My issue was first noticed in CAS, where the walls were completely missing and invisible. The paintings were still there, and so was the window, even the background is clear and unaltered, but no walls. There seems to be some kind of remnant of them, though? As if their texture were unreadable or, God forbid, corrupt. The amount of flickering pixels I got would change on how I edited the graphics settings in-game, but as of yet they have not been affected by what I have tried to do outside of the game (i.e., graphic rules maker, code editing, 4 GB patch, etc.)
*Note: I have all these applied and have totally exhausted every imaginable option.
Just to double-check, I went to see if this manifested itself outside of CAS as well, because if it was only there then I could have dealt with it; but of course, it seems to be everywhere. The weird thing is that everything else seems to be perfectly fine and rendered to an optimal state, it's just the walls that are giving me problems. They don't flash, they're not pink, they're just - not fully there, I guess.
I'd sincerely appreciate any kind of help anyone could give me in (hopefully) solving this issue because this is one of my favorite games and I'd hate to see it unplayable after so much work has been done already to simply get it to run.
I've included my system specs below and some photos of what I'm experiencing, thanks in advance guys!

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SYSTEM SPECS:

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System Information
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Time of this report: 2/29/2020, 14:27:01
Machine name: DESKTOP-FT67EHB
Machine Id: {F1102D93-461B-4EB1-82DF-7829D6BA173C}
Operating System: Windows 10 Home 64-bit (10.0, Build 18362) (18362.19h1_release.190318-1202)
Language: English (Regional Setting: English)
System Manufacturer: ASUSTeK COMPUTER INC.
System Model: G752VL
BIOS: G752VL.208 (type: UEFI)
Processor: Intel(R) Core(TM) i7-6700HQ CPU @ 2.60GHz (8 CPUs), ~2.6GHz
Memory: 12288MB RAM
Available OS Memory: 12226MB RAM
Page File: 4778MB used, 9304MB available
Windows Dir: C:\WINDOWS
DirectX Version: DirectX 12
DX Setup Parameters: Not found
User DPI Setting: 96 DPI (100 percent)
System DPI Setting: 96 DPI (100 percent)
DWM DPI Scaling: Disabled
Miracast: Available, with HDCP
Microsoft Graphics Hybrid: Not Supported
DirectX Database Version: Unknown
DxDiag Version: 10.00.18362.0387 64bit Unicode

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Display Devices
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Card name: NVIDIA GeForce GTX 965M
Manufacturer: NVIDIA
Chip type: GeForce GTX 965M
DAC type: Integrated RAMDAC
Device Type: Full Device (POST)
Device Key: Enum\PCI\VEN_10DE&DEV_1619&SUBSYS_1CED1043&REV_A1
Device Status: 0180200A
Device Problem Code: No Problem
Driver Problem Code: Unknown
Display Memory: 8130 MB
Dedicated Memory: 2016 MB
Shared Memory: 6113 MB
Current Mode: 1920 x 1080 (32 bit) (60Hz)
HDR Support: Not Supported
Display Topology: Internal
Display Color Space: DXGI_COLOR_SPACE_RGB_FULL_G22_NONE_P709
Color Primaries: Red(0.636719,0.347656), Green(0.333984,0.627930), Blue(0.154297,0.049805), White Point(0.313477,0.329102)
Display Luminance: Min Luminance = 0.500000, Max Luminance = 270.000000, MaxFullFrameLuminance = 270.000000
Monitor Name: Generic PnP Monitor
Monitor Model: unknown
Monitor Id: LGD04E8
Native Mode: 1920 x 1080(p) (60.020Hz)
Output Type: Internal
Monitor Capabilities: HDR Not Supported
Display Pixel Format: DISPLAYCONFIG_PIXELFORMAT_32BPP
Advanced Color: Not Supported
Driver Name: C:\WINDOWS\System32\DriverStore\FileRepository\nvam.inf_amd64_1aae4f19e68d0780\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvam.inf_amd64_1aae4f19e68d0780\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvam.inf_amd64_1aae4f19e68d0780\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvam.inf_amd64_1aae4f19e68d0780\nvldumdx.dll
Driver File Version: 23.21.0013.8857 (English)
Driver Version: 23.21.13.8857
DDI Version: 12
Feature Levels: 12_1,12_0,11_1,11_0,10_1,10_0,9_3,9_2,9_1
Driver Model: WDDM 2.3
Graphics Preemption: DMA
Compute Preemption: DMA
Miracast: Not Supported by Graphics driver
Detachable GPU: No
Hybrid Graphics GPU: Not Supported
Power P-states: Not Supported
Virtualization: Not Supported
Block List: No Blocks
Catalog Attributes: Universal:N/A Declarative:N/A
Driver Attributes: Final Retail
Driver Date/Size: 12/3/2017 7:00:00 PM, 945368 bytes

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Sound Devices
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Description: Speakers (Realtek High Definition Audio)
Default Sound Playback: Yes
Default Voice Playback: Yes
Hardware ID: HDAUDIO\FUNC_01&VEN_10EC&DEV_0668&SUBSYS_10431CED&REV_1000
Manufacturer ID: 1
Product ID: 100
Type: WDM
Driver Name: RTKVHD64.sys
Driver Version: 6.00.0001.7599 (English)
Driver Attributes: Final Retail
WHQL Logo'd: Yes
Date and Size: 9/1/2015 12:00:00 AM, 4595968 bytes


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Disk & DVD/CD-ROM Drives
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Drive: C:
Free Space: 56.7 GB
Total Space: 952.8 GB
File System: NTFS
Model: HGST HTS541010A9E680

Drive: F:
Free Space: 3349.6 GB
Total Space: 3815.4 GB
File System: NTFS
Model: WD easystore 25FA USB Device

Drive: D:
Model: MATSHITA DVD-RAM UJ8HC