Press Ctrl + F in Regedit to open the "Find" dialog box. Type "RunMRU" and search for it throughout the registry. If it's not found, try searching for "MRU" or "Run" keys. By the way, you can try resetting Windows Explorer settings to their default values. Go to Settings > Apps > Startup, and toggle off any unnecessary startup programs. Then, go to Settings > System > Recovery, click on "Open system protection", select "Windows 11", and click on "Reset".
