When I typed netsh wlan show drivers in command prompt and press enter.
It will shows
In the output Hosted network supported :Yes that means that computer supports hosted networks.
Now, when I typed netsh wlan start hostednetwork in command prompt to start the hotspot I just created, it says "The hosted network couldn't be started. The group or resources is not in the correct state to perform the requested operation."
sounds to me like you missed step 5.
Create. Type netsh wlan set hostednetwork mode=allow ssid=Hotspotname key=password in Command prompt. This will create a Hotspot but it is currently offline.
the ssid can be anything and the key can be anything i'd assume, even tho for their example they have used hotspotname and password.
Here right click on the Connection that you use to connect to internet and select properties
i assume would be your lan connection and not the broadcom wifi adaptor.
and select the network connection name that is used by your hotspot.(For this check the Network Connection Window and look for Connection which says Microsoft Hosted Network Virtual Adapter).
from the example it would be hotspotname.
full step 9 instructions.
Internet. To share your internet connection on this hotspot go to the Network and sharing center and click on Change adapter setting. Here right click on the Connection that you use to connect to internet and select properties. In properties go to Sharing tab and check the box "Allow other network users to connect through this computer's internet connection and select the network connection name that is used by your hotspot.(For this check the Network Connection Window and look for Connection which says Microsoft Hosted Network Virtual Adapter). And save it. Now your inter net connection is shared.
should then just be a case of using your phone finding the hotspotname wifi connection and connecting to it with the key/passphrase password if you've followed the instructions word for word.
sorry don't have a windows pc setup to test if it works or not but the instructions seem clear enough, so don't see why it shouldn't work.
first thing i'd test tho is to see if the broadcom wifi adapter does have the correct drivers installed and does work in your pc, so you should be able to connect your pc to a wifi network and get onto the internet before trying to set it up as a hotspot for your phone to use and connect to the internet through your lan.