It is highly recommended to download drivers from your laptop manufacturer's support site using your serial number or service tag. Atheros AR9285 Driver Issues & No Wireless
Offers multiple versions, including v.9.1.0.328 and v.8.0.0.316 , which are recommended for Inspiron series laptops.
You're looking for a report on the Atheros AR9285 driver for Windows 7 64-bit. Here's what I found:
Instead of linking to unknown EXE files, search for these (they are clean driver cabinets):