Help! Ultra-Slow Or No Startup After Using WUA To Install 2004

Computer Type: PC/Desktop
System Manufacturer/Model Number: Alienware® ALX x58
OS: Win10 Pro - x64 latest build dual boot w/Win 11 Pro
CPU: Intel® Core™ i7-975 Extreme 3.49 GHz, 8MB Cache
Motherboard: Asus® P6T Deluxe V2 x58 LGA1366
Memory: 24GB Corsair Vengeance DDR3 SDRAM
Graphics Card: GeForce GTX690 Dual Core GPU
Sound Card: Onboard Soundmax® High-Definition 7.1 Performance Audio
Monitor(s) Displays: Samsung® XL2370 LED backlit 23" W/S 2ms response time
Screen Resolution: 1920 X 1080
Keyboard: Logitech MX Keys S
Mouse: Logitech MX Master 3S
PSU: Alienware® (Thermaltake ToughPower) 1200 Watt Multi-GPU
Case: Alienware® P2 ALX Chassis with AlienIce™ 3.0 Video Cooling
Cooling: Alienware® High-Perf. Liquid Cooling + Acoustic Dampening
Hard Drives: 2 X 500gb SATA 1 X 1TB SATA 1 X 3TB eSATA LaCie External (Non-RAID)
Internet Speed: 1000mbps Unlimited Up & Down
Browser: FF, CH, Edge
Antivirus: Windows Defender with Malwarebytes Premium as an optional scanner.
Other Info: Using non-RAID on purpose as I find RAID too fussy and temperamental. In AHCI. Also onboard is a Fax Modem, which is supported in Windows 10. Win 11 installed using a USB stick made using Rufus to bypass incompatibility issues.