What you really want to watch out for even more so than color change, is meat or poultry that has a bad odor or is sticky, tacky, or slimy to the touch. Let your other senses be your guide in these instances. Read more: The Color of Meat and Poultry - USDA.
Windows Management Instrumentation(WMI) is a set of extensions to the Windows Driver Model that provides an operating system interface through which instrumented components can provide information and notification.
wmiapsrv.exe is a WMI performance adapter which collects information regarding performance. This program is a non-essential system process, but should not be terminated unless suspected to be causing problems. wmiapsrv.exe is a system process that is needed for your PC to work properly. It should not be removed.