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How to Fix Unarc.dll Returned an Error Code (FitGirl Repacks)

Jake Colins

So you’re installing a FitGirl repack. Everything looks fine. The progress bar moves. You get excited. Then boom — “Unarc.dll returned an error code” pops up and ruins your day.

Don’t panic. This error is very common. And yes, it is fixable. You just need to understand what’s causing it.

TLDR: The Unarc.dll error usually happens because of corrupted files, low RAM, antivirus interference, or missing system components. Start by verifying files and disabling antivirus. Then check your RAM, disk space, and Windows updates. In most cases, one of these quick fixes solves the problem.

What Is the Unarc.dll Error Anyway?

First, let’s keep it simple.

Unarc.dll is a Windows library file used during decompression. FitGirl repacks compress games heavily. That’s how they make them smaller to download. During installation, your PC must unpack all those files.

If something interrupts the unpacking process, you get an error.

The message may look like this:

Different code. Same headache.

Why This Error Happens

Here are the most common reasons:

Now let’s fix them one by one.

1. Check If Your Files Are Corrupted

This is the most common cause.

If even one small file is damaged, the installer will fail.

What to Do:

If you skipped this step before, do it now. It fixes many cases instantly.

2. Turn Off Antivirus (Very Important)

Antivirus programs love to interfere with repacks.

They often delete crack files. Or block decompression. Sometimes they quarantine Unarc.dll.

And they rarely tell you clearly.

Steps:

  1. Disable Windows Defender temporarily.
  2. Turn off any third party antivirus.
  3. Add the game folder to exclusions.
  4. Run the setup again.

After installing, you can turn protection back on.

Important: Always download repacks from trusted sources only. Safety still matters.

3. Check Your RAM

FitGirl installers use heavy compression. That means RAM usage can spike.

If you have only 8GB of RAM and other programs are open, the installer may crash.

Try this:

If the repack gives a “limit RAM usage to 2GB” option, enable it.

Yes, installation will be slower. But more stable.

How to Test RAM Health

You can use Windows Memory Diagnostic:

  1. Press Windows + R
  2. Type mdsched.exe
  3. Restart and scan

If errors show up, your RAM may be faulty.

4. Make Sure You Have Enough Disk Space

This one sounds obvious. But many people miss it.

Compressed size is not the same as installed size.

A 40GB repack might need 80GB after installation.

Do This:

If your drive is almost full, errors happen more easily.

5. Install or Reinstall Required Programs

Sometimes Windows is missing important components.

FitGirl installers usually include them. But not always perfectly.

You may need:

Install or reinstall these from official Microsoft sources.

6. Check Your Hard Drive for Errors

If your HDD or SSD has bad sectors, decompression may fail.

This is especially common with older hard drives.

Run a Disk Check:

  1. Open Command Prompt as Admin
  2. Type: chkdsk C: /f /r
  3. Press Enter
  4. Restart if prompted

Replace C with your install drive letter if needed.

This scan may take time. Be patient.

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7. Remove Overclocking

Overclocked CPU? Overclocked RAM?

That might be the hidden villain.

Decompression is CPU intensive. If your system is unstable, it will crash here first.

Fix:

If it works after this, your overclock is not stable.

8. Increase Virtual Memory

Low RAM plus low page file equals disaster.

Increasing virtual memory can help.

Steps:

  1. Open System Properties
  2. Go to Advanced system settings
  3. Under Performance click Settings
  4. Go to Advanced tab
  5. Click Change under Virtual Memory

Set custom size:

Adjust based on your system RAM.

9. Common Error Codes and What They Mean

Error Code Meaning Most Likely Fix
-1 General decompression failure Recheck files, disable antivirus
-11 RAM related error Test RAM, enable 2GB limit
-12 Disk write error Check disk space and health
-14 Corrupted archive Redownload files

This table saves time. Screenshot it if needed.

10. The “Safe Install” Method

If you’re tired of trial and error, follow this checklist:

Seriously. Do nothing while installing.

No YouTube. No gaming. No multitasking.

Let it finish peacefully.

What NOT to Do

Avoid these mistakes:

Downloading random DLL files can make things worse. Or infect your system.

When Nothing Works

If you tried everything:

Sometimes the OS itself is corrupted.

And yes, occasionally the repack itself is broken.

Final Thoughts

The Unarc.dll returned an error code problem looks scary. But it’s usually simple.

In most cases, it’s one of these:

Work through fixes calmly. Step by step.

Don’t rush. Don’t randomly change system files.

And remember — heavily compressed repacks push your PC hard. Stability matters.

Now go fix that error. Your game isn’t going to install itself.

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