Hello Tristan, sorry about your problems. My name is Marco and I will do my best to help you.
You say you tried with the registry but what exactly?
I will write you the procedure, check if you have done the same as below.
Use the following steps:
-Open the Registry Editor by searching for "regedit" in the Start menu and clicking the top result.
-Click yes if prompted by User Account Control.
-Navigate to HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\Explorer. If the Explorer key does not exist, right-click on Windows and create a new key called Explorer.
-Create a new DWORD (32-bit) registry key and name it DisableSearchBoxSuggestions.
-You can create a new registry key by right-clicking in the right window pane and selecting New->DWORD.
-Double-click on DisableSearchBoxSuggestions to edit it and set the Value data field to 1 and click OK.
- Close the Registry Editor and reboot your computer.
Alternatively, you can use the Group Policy Editor to disable web search in Windows 11. This method is recommended for users running Windows 11 Pro or higher. Here are the steps:
-Press Windows + R, type in gpedit.msc, and press Enter.
-Navigate to User Configuration > Administrative Templates > Windows Components > File Explorer.
and enable the "Turn off display of recent search entries in the File Explorer search box" policy.
Note that disabling web search completely may affect the functionality of the Start menu and search box. If you want to keep some web search functionality, you can use third-party tools or apply content filters to your search results.