Urgent Support Required – Post Upgrade Issues (Windows 10 to Windows 11)

Hello Mohamed, I am Henry and I want to share my insight about your issue.

The symptoms you've described are common after a major in-place upgrade and almost always point to underlying driver or system file incompatibilities that were not resolved during the upgrade process.

Here is an action plan to diagnose you can refer to:

Solution 1: Outdated or generic drivers from the upgrade process are the most likely cause for both the lag and the black screens.

1. Update Graphics Driver:

• Go directly to the manufacturer's website (e.g., NVIDIA, AMD, Intel) or your computer hardware vendor's site (e.g., Dell, HP, Lenovo) to download the latest graphics driver certified for Windows 11.
• Action: Perform a "clean installation" of the graphics driver. This option is available in the installer for NVIDIA and AMD drivers and removes old, potentially conflicting settings.

2. Update Chipset and Storage Drivers:

• Go to the support page for your specific computer models and download and install the latest Chipset drivers and Storage (SATA/NVMe) drivers for Windows 11. These are essential for core system performance.

3. Update BIOS/UEFI Firmware:
   • Check for and install the latest BIOS/UEFI update from your hardware manufacturer. Firmware updates often include critical compatibility and stability fixes for new operating systems.

Solution 2: Repair the Operating System

1. Run System File Checker (SFC): This will scan for and repair corrupt Windows system files.
   • Open Command Prompt as an administrator.
   • Run the command: sfc /scannow
2. Run DISM (Deployment Image Servicing and Management):
   • In the same administrative Command Prompt, run: DISM /Online /Cleanup-Image /RestoreHealth
   • After DISM completes, it is best practice to run sfc /scannow one more time.

Hope one of these works for you. If you find this guidance helpful, you're welcome to click 'Accept Answer'—it helps others find useful solutions too.