Two user accounts on a Windows 8.1 HTPC with a Core i5 cpu, both ordinary user accounts, no elevated privileges. One is fine, but the other account will spike CPU to 80% to cause core temp to get very high after WMC has been running for about 10 minutes - whether it is playing TV, recording TV, playing a video, or simply idling makes no difference. the offending process is windows media player - wmplayer.exe - it starts after WMC has been running for ~10 minutes, and the spike starts with it. Load returns to normal if I kill the wmp process, but it will restart itself as long as I use WMC. I presume WMP is indexing, but I don't know why - this user does not use WMP. there are no folders in the Windows Music, Pictures, Videos Libraries that contain any files, and only recorded TV (local HDD) and shared videos (file server) in WMC's libraries.
The other account is fine, WMC usage causes no problems, CPU usage stays under 10% and temps in the 30s.
Does anyone know why this is happening? Thanks in advance!