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"Could not call proc" runtime error? 8 fixes that work

✓ Reviewed & updated July 2026

By the ErrorAway Team · Hands-on tested on Windows 10 & 11

You're installing a game, or launching one you've played a hundred times, and Windows throws a Runtime Error: "Could not call proc." Five words, zero explanation. What it actually means: the program tried to run a procedure from a system library and that call failed — almost always because a runtime library (usually Visual C++) is missing or broken, the program lacks permissions, or something like antivirus got in the way. It looks cryptic, but the fix list is short and well-proven.

Work through these in order — fix 2 alone resolves most cases.

Quick checklist

  1. Run the program (or installer) as administrator
  2. Repair the Visual C++ Redistributables
  3. Verify the game's files (Steam / Epic)
  4. Fix the TEMP folder path (installer errors)
  5. Let it through your antivirus
  6. Run SFC and DISM scans
  7. Try compatibility mode
  8. Reinstall the program

What causes "Could not call proc"

This is a generic runtime failure, but in practice it clusters around a few causes: missing or corrupted Microsoft Visual C++ Redistributables (the shared libraries most games depend on), permission problems, a misconfigured TEMP folder during installs, antivirus blocking a system call, or corrupted Windows/system files. The fixes below go after each one, most-likely first.

The 8 fixes

1

Run as administrator

If the program can't reach what it needs due to permissions, the call fails with exactly this error.

  • Right-click the game/program (or its installer) → Run as administrator → Yes.
  • If it works, make it stick: right-click → Properties → Compatibility → tick Run this program as an administrator.
2

Repair the Visual C++ Redistributables

The number-one cause. Most games call procedures from these shared Microsoft libraries — if they're damaged or a version is missing, you get this error.

  • Download the latest Visual C++ Redistributable packages from Microsoft's official site — install both x86 and x64 versions.
  • For already-installed versions: Settings → Apps → find each "Microsoft Visual C++ Redistributable" → Modify → Repair where offered.
  • Older games may also need the 2010-2013 packages — a game's own _CommonRedist folder (inside its install folder) often contains the exact ones it needs; run those installers.
  • Restart your PC and try again.
3

Verify the game's files

If it's a Steam or Epic game, a corrupted file can break the launch. Verifying replaces only what's damaged — saves stay safe.

  • Steam: Library → right-click the game → Properties → Installed Files → Verify integrity of game files.
  • Epic: Library → three dots under the game → Manage → Verify.
4

Fix the TEMP folder path

Strange but true: if this error appears while installing something, a wrongly-pointed TEMP folder is a classic cause. Pointing it back for the session fixes it.

  • Click Start, type cmd, right-click Command Prompt → Run as administrator.
  • Run these two lines:
    set TEMP=C:\Windows\temp
    set TMP=C:\Windows\temp
  • Now run the installer from that same Command Prompt window (type the installer's full path and press Enter), or simply retry the install.
5

Let it through your antivirus

Overprotective antivirus can block the exact system call the program is making.

  • Briefly disable third-party antivirus and try the program.
  • If it works, add the program's folder to your antivirus exclusions, then re-enable protection.
6

Run SFC and DISM scans

Corrupted Windows system files can break procedure calls system-wide. These built-in tools repair them.

  • Open Command Prompt as administrator.
  • Run sfc /scannow and let it finish.
  • Then run DISM /Online /Cleanup-Image /RestoreHealth.
  • Restart and test.
7

Try compatibility mode

Older games sometimes make calls that newer Windows handles differently. Compatibility mode bridges that gap.

  • Right-click the program → Properties → Compatibility.
  • Tick Run this program in compatibility mode for and pick Windows 8 (or the version the game was built for).
  • Apply and launch.
8

Reinstall the program

If only one program throws the error after everything above, its own files are damaged — a clean install replaces them.

  • Uninstall via Settings → Apps, restart, and reinstall from the official source (or your Steam/Epic library).
  • For installer errors, re-download the installer first — a half-downloaded file causes exactly this.

Frequently asked questions

What does "Could not call proc" actually mean?

"Proc" is short for procedure — a function inside a system library. The program asked Windows to run one and the call failed, usually because the library (most often Visual C++) is missing, broken, or blocked. It's a software/file problem, not failing hardware.

It only happens with one game. Is the game broken?

Probably just its files or its bundled runtimes. Verify its files (fix 3), run the installers in its _CommonRedist folder (fix 2), and reinstall if needed (fix 8).

Is it safe to reinstall the Visual C++ Redistributables?

Yes, completely. They're free shared Microsoft packages that many programs use. Repairing or reinstalling them doesn't touch your personal files — and it's the single most effective fix for this error.

I get it during installation, not launch. Same fixes?

Yes, with two extras that matter most for installs: re-download the installer in case it's corrupted (fix 8), and reset the TEMP path (fix 4) — a mislocated TEMP folder is a known cause of installer runtime errors.

Related fixes: "Bad Image" error 0xc0000020 (same Visual C++ family) · Steam "Game launch failed" (Error 54) · Steam won't open. Still stuck? Send us the details.

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