The persistence of search queries related to "BCM2045 driver XP" years after the OS's end-of-life highlights the friction users experienced. Because Windows XP was a 32-bit dominant architecture (though 64-bit versions existed), driver compatibility was strict. A driver designed for a newer chipset often would not function on the BCM2045, and conversely, the BCM2045 driver often failed on early iterations of Windows Vista or 7.
Since Broadcom no longer hosts these legacy files directly, you may need to look at: bcm2045 driver xp
Trusted repositories like DriverGuide or the Internet Archive often host the original WIDCOMM setup files for XP. The persistence of search queries related to "BCM2045