Do not guess. Here is how to know for sure you have a BCM430N:
Updating your Broadcom BCM430n driver for Windows 7 is essential to ensure that your wireless adapter functions properly. An outdated driver can cause a range of problems, including: broadcom bcm430n driver windows 7
A: Go to https://www.catalog.update.microsoft.com/ and search for "Broadcom 802.11 Network Adapter network driver Windows 7." Filter by date (2015-2016). Those are the last stable builds. Do not guess