有網友說它是迅雷的後臺下載程序，可以全部關閉的。
其實是不正確的，經過核實，pcalua.exe是windows的系統文件，Windows程序兼容性助理(Program Compatibility Assistant)的壹個組件而已。
相關說明：
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.
這個程序會關聯壹些軟件，來達到檢測軟件和windows的兼容性！
測試發現，刪除相關任務不會對系統有影響！
可通過第三方軟件如360安全衛士或者優化大師在系統服務中禁用。
如果不懂可HI我。