pcalua.exe位置在C:\windows\system32下
有网友说它是迅雷的后台下载程序，可以全部关闭的。
其实是不正确的，经过核实，pcalua.exe是windows的系统文件，Windows程序兼容性助理(Program Compatibility Assistant)的一个组件而已。
相关说明：
The Program Compatibility Assistant detects known compatibility issues in older programs. After you have run an older program in this version of Windows, it notifies you if there is a problem and offers to fix it the next time you run the program. If the compatibility issue is serious, the Program Compatibility Assistant might warn you or block the program from running. If that happens, you'll have the option to check online for possible solutions.
这个程序会关联一些软件，来达到检测软件和windows的兼容性！
测试发现，删除相关任务不会对系统有影响！