The key below is marked by adwcleaner as PUP.  When I delete it, It keeps coming back, no matter what I do.

I delete, reboot and it is back. I manually delete, run the scan again and it is gone. Howevever, it comes back in 15-30 minutes, even if I do not reboot.

This is the key:  HKCU\Software\Microsoft\Windows\CurrentVersion\Ext\Stats\{3CA2F312-6F6E-4B53-A66E-4E65E497C8C0} 

Is this something I can ignore or is this an issue I need to resolve?