One thing to remember, especially with Dell laptops, is that the OEM uses some proprietary software/drivers that don't always get along with WAPs. If a Dell has the "Unified Wireless Driver" software (or whatever it's called), you should definitely uninstall that POS software, uninstall the driver, reboot and let Windows reinstall the drivers. Unfortunately, most of the time you won't be able to update the driver and are stuck with whatever 3 year old driver Dell has released. I refuse to use HP products, so not sure if they're still as bad as Dell for that.
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