USB network adapter

This will be one of the easiest add on you have ever done on a computer.

1) Absolutely it will work

2)You can leave the wireless card in your computer. Just click on Control Panel, Device Manager, then click on Network Adapters. Now Right click on the internal network adapter in your system and click on Disable.

3)Yes you will get both bands. Just make sure to buy an adapter that is 802.11 ac.

4)Very easy to install. Generally you install the drivers from a driver disc (which comes with the adapter), then plug the adapter in and you are done. When you connect to your wifi in the house, be sure you connect to the 5 GHz band. Usually the SSID will be sometning like.. mywifi-5G. Mywifi being the actual name of your SSID.

What is the model number of your computer?

I'll answer your questions and then suggest better options for your issue.  Yes as long as that WiFi card offers drivers for the Windows version you're running, it will work.  No, you won't have to remove your existing WiFi card.  Whether it gets 2.4 and 5 GHz signals depends entirely on the product itself.  That's determined by the WiFi chipset in the adapter you buy.  It should be a simple matter of plugging the USB adapter into a USB port and then possibly installing drivers, although even that might happen automatically via Windows Update or built-in Windows support.  After that, it works just like any other WiFi adapter.

But I have two suggestions.  First, if you're buying a new WiFi card, you should really get one that also supports 802.11ac, not just BGN.  And second, you'll get far better performance, and probably a lower cost, by replacing the internal WiFi card.  The reason you'll get better performance is because the built-in WiFi card connects to long antennas that run into the display assembly.  By comparison, a USB WiFi adapters always involve a tradeoff.  Either they're very small in order to be unobtrusive, which means they have small antennas that won't perform as well, or they have a separate external antenna array that plugs into them, which enhances performance but obviously makes the WiFi adapter a lot less portable.  And either way, you also lose a USB port.  On most systems, an internal WiFi card takes about 3-5 minutes to install even if you've never done it before.  The Owner's/Service Manuals for Dell systems, all available on support.dell.com, include step-by-step procedures complete with diagrams that show how to remove and replace every component of the system, so you can see what it would involve if you're worried, but it's usually a matter of just removing the bottom cover and then just popping the card out.

Since you didn't mention which model Inspiron you have, I don't know what type of slot your system's motherboard uses for your WiFi card, and therefore I can't make a specific product recommendation, but if you want to post that, I can do that.  But a top-end Intel 802.11ac internal WiFi card costs about $35, just to give you an idea.  If you go the USB route, you'll either spend more than that for less performance, or spend about that amount for a LOT less performance.

1.  Will this item work?

yes it absolutely will work! I just bought the Asus AC-53 Nano. 

2.  Must I take out the wireless network adapter card from my laptop?

Nope! You could go in and disable it so your wireless connection doesn’t automatically connect to your old device.

3.  Will I get 2.4 and 5.0 GHz signals?

If the adapter you purchase supports both and your router at home is either of those, yes you will get both signals

4.  Should it be easy to install and use, or will there be a need for technical assistance.?

plug and play! I put my device in and turned on my computer. Upon logging in, the device automatically installed and was ready to go. Once I was connected to my network, I downloaded the most current drivers as well.