Acer TravelMate 2490 vs. Windows 8.1 error message: ATTEMPTED SWITCH FROM DPC

After installing Windows 8.1 to Acer Travelmate 2490 two errors remain.
1. Atheros wifi adapter.
2. Card reader.

1. Atheros wifi adapter:
You can download Atheros wifi driver for Windows Vista 32 bit from here.
(There are wifi drivers for Atheros, Broadcom and Intel, but I experienced problem only with Atheros.)
Result of installing  looks OK (with setup.exe), but wifi driver won't be installed.

Solution:
In Device manager on wifi card right click.
Then Update Driver...(Choose the map, you extracted drivers before.)
Install driver.

2. Card reader:
It's unnecessary to install driver, because after installing at starting, Windows 8.1 runs to an error:
"ATTEMPTED SWITCH FROM DPC"

Solution:
In Device manager on card reader right click, and click Disable.
It solves the problem, but you won't use card reader of course (an USB card reader is cheap...or you can enabled this device when you need to read an XD or SD memory card - then disable it again).

Source:
answers.yahoo.com