Guys I think I know the culprit. After the update 8.00-5400, HWiNFO task's action (inside Task Scheduler) point to the program without the double quotation marks ("") surrounded. Therefore, the Task Scheduler interprete its location as "C:\Program" with argument "Files\HWiNFO64\HWiNFO64Launcher.exe". The fix is simply adding the double quotation marks around, so its original location C:\Program Files\HWiNFO64\HWiNFO64Launcher.exe (no quotation marks) becomes "C:\Program Files\HWiNFO64\HWiNFO64Launcher.exe" (with quotation marks). You may also check the "Start in (optional)" box and make sure it looks like C:\Program Files\HWiNFO64\ (without quotation marks). Voila, it's working again.