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I have a Dell desktop, w/WinXP sp2. On the Device manager the multimedia controller properties says, Other devices; mfg. unknown; location PCI Slot 4 (PCI bus 2, device 10, function 1). There is a question mark in front of it and I can't load any drivers because I can't find any. also have a Sound, video and game controller with same problem except location is PCI Slot 4 (PCI bus 2, device 10, function 0). I can't figure this one out. JC

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Both “Unknown” entries using the same PCI bus/device but different function numbers is the main clue: that pattern normally means one physical, multi‑function PCI adapter is exposing two logical functions (function 0 and function 1). The correct driver package will usually install both functions at once, so identifying the adapter is the goal.

Capture the device hardware IDs from Device Manager (open the unknown device, Properties -> Details -> Hardware Ids). Look for a string like PCI\VEN_XXXX&DEV_YYYY and use a PCI ID lookup such as to map VEN (vendor) and DEV (device) to a maker/model. That gives a clear target for which driver to download.

Once vendor/chipset is known, obtain a driver that explicitly lists Windows XP and the correct architecture (32/64‑bit). Install with the vendor installer or via Device Manager -> Update Driver -> Have Disk after extracting the package. If problems persist, uninstall the unknown device entries, reboot, then install the correct driver. Creating a restore point before changing drivers is recommended on XP systems.

System Information (msinfo32) or a motherboard/add‑in card part number can also help when a driver page is not obvious. Avoid generic “driver updater” utilities; prefer vendor or motherboard/chipset sources. As indicated, model‑matched drivers are preferable, and as noted, the reported location string is less useful than the bus/device/function pattern for confirming a multi‑function PCI device.

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Member Avatar for bobbyraw

it does not amtter where windows is reporting the devices to be, just follow caperjack link

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