Check your Windows Task Scheduler. CleanMem relies on scheduled tasks to run; if these are disabled, the monitor may not initialize properly. CleanMem for Windows - Download it from Uptodown for free
The Pro version, which costs approximately , requires a serial number (registration key) to unlock advanced features: cleanmem mini monitor serial number new
Ensure there are no extra spaces before or after the serial number. Keys are usually case-sensitive. Check your Windows Task Scheduler