NS_E_BKGDOWNLOAD_CALLFUNCTIMEOUT fix – what actually works

Cause #1: Proxy settings blocking the download

This is the most common reason you see this error. Windows Media Player tries to grab metadata or album art from the internet, and your proxy setup chokes on it. I've seen this on corporate laptops, home setups with a VPN, and even on clean Windows 10 machines with some proxy leftovers from an old connection.

Don't waste time checking antivirus or firewall first. Start here.

Fix: Reset IE proxy settings (it controls Windows Media Player's internet access)

1. Hit Windows Key + R, type inetcpl.cpl, press Enter.
2. Go to the Connections tab.
3. Click LAN settings at the bottom.
4. Uncheck Use a proxy server for your LAN. If you need a proxy for other stuff, leave it checked but click Advanced and add 127.0.0.1 as an exception for local addresses.
5. Check Automatically detect settings.
6. Click OK on both windows.
7. Open Command Prompt as admin and run:

   netsh winhttp reset proxy

Reboot and test Windows Media Player. If the error disappears, that was it. If it doesn't, move to the next cause.

Cause #2: Corrupted background download cache

Windows Media Player stores temporary download info for album art, ratings, and stuff in a hidden folder. If that cache gets corrupted — which happens way more often than Microsoft admits — you get this timeout. I've seen this after a failed Windows update or a dirty shutdown.

Fix: Delete the cache folder

1. Close Windows Media Player completely.
2. Open File Explorer and paste this in the address bar:

   %LOCALAPPDATA%\Microsoft\Media Player

3. Delete everything inside that folder. Don't delete the folder itself, just its contents. You'll see a bunch of .dat and .wmdb files.
4. Open Windows Media Player again. It'll rebuild the cache from scratch. This takes a minute or two.

If you're on Windows 11, the path is identical. If you're paranoid, rename the folder to Media Player.old first and see if it fixes it. But honestly, just delete the contents.

Cause #3: Corrupted COMCTL32.ocx or missing runtime

This one's rarer but I've hit it on a few machines running Windows 10 21H2 and earlier. The error code 0XC00D1266 sometimes links to a broken COM control that handles background calls. You'll know this is the problem if the error happens even after fixing proxy and cache.

Fix: Re-register the COM control

1. Open Command Prompt as administrator.
2. Run:

   regsvr32 %windir%\syswow64\comctl32.ocx

   If you're on a 32-bit OS, use:

   regsvr32 %windir%\system32\comctl32.ocx

3. You should get a success message. If it says module not found, download the Visual Basic 6 runtime redistributable from Microsoft's site and install it, then try again.

I've also seen this fix work on Windows 11 after a fresh install of the Media Player via the optional features menu. If the file doesn't exist, it's usually because someone removed it with a debloat tool. Re-add the Media Player feature from Settings > Apps > Optional Features.

Quick reference table

Start with the proxy reset. That'll fix most people. If not, nuke the cache. The COM thing is a long shot but worth trying before you reinstall Windows or something drastic.

One more thing: don't run a system file checker (SFC) for this error. It almost never helps with this specific code. I've seen people waste hours on it. Stick to the steps above and you'll be done in 10 minutes.