Reliable connectivity requires the Atheros or Intel Wireless LAN Driver and the Atheros LAN Driver for wired Ethernet.
The best place to find the correct drivers for your ASUS K43S laptop is from the official ASUS website. Here are the steps to follow:
Depending on your exact configuration, you may need the following: K43SJ - Support - ASUS
The is a capable older laptop, but its driver ecosystem is legacy-only . If you stick with Windows 7 or Linux , you can maintain full hardware functionality. Windows 10 is not recommended unless you are comfortable troubleshooting missing features. Always keep an archived copy of the official ASUS driver folder — they are increasingly hard to find as ASUS removes older product pages.
: If you are experiencing system hangs or battery issues, consider checking the BIOS section for updates like Version 317, which improves software compatibility. K43E - Support - ASUS