I have a DELL all-in-one desktop operating on Windows 7, but Windows 10 informs me that there will be problems with the Broadcom virtual wireless adapter. Is there an upgrade for this?
Although the upgrade is performed correctly, the wireless device won't work normally. You will have to check the support page for your product in order to download drivers for Windows 10 (if released!). It's possible that the manufacturer hasn't released drivers for Windows 10 yet. However, you can try installing the Windows 8.1 drivers. Most of the drivers released for Windows 8.1 work normally in Windows 10.
Dell Support: http://www.dell.com/support/home/us/en/04