TASK MANAGER BIT WORKING

After Task Manager developed severe UI rendering lag and grey placeholder icons across all user profiles, we performed a Windows 11 In-Place Repair Upgrade, re-registered AppX packages, cleared local AppData caches, created a clean test administrator profile, executed a clean boot, and rebuilt performance counters, but Task Manager still freezes or fails to open due to a persistent system-wide DWM rendering or service failure.

PLS HELP ME