Fix Modern Warfare 2 33/39/45 Files Failed to Validate & Will Be Reacquired

 Fix Modern Warfare 2 33/39/45 Files Failed to Validate & Will Be Reacquired

The early access for Call of Duty Modern Warfare 2 is now finally out. But still, many players are experiencing many errors, bugs, and crashing issues when they launch this massively popular game. One such issue includes 33/39/45 files that failed to validate and will be reacquired error. When this issue triggers, players fail to launch the game. If you are facing the same issue and can’t launch the game, check out this guide as we have compiled some possible solutions to fix this issue.

Fixing CoD Modern Warfare 2 33/39/45 Files Failed to Validate & Will Be Reacquired

If you are wondering why this error appears, well, through integrity verification of the game, Steam goes through an activity and compares all the files from the installed game to the one saved on the server. Thus, the meaning of this error is that the process failed to verify the game files. Thankfully, you can try the following potential workarounds to fix this error.

Before you start the following troubleshooting guide, make sure your game is updated to the latest version. For this, go to Steam Library, right-click on the game, and select Properties. Next, go to the update tab and click on “Always keep this game updated”. Besides, if you have any pending updates, make sure to update it to the latest version.

If you have already updated your game and are facing the same issue, try the following workarounds.

1. Clear Out Download Cache

Clearing out the download cache is the first method we recommend to fix CoD Modern Warfare 2 33/39/45 Files failed to validate & will be reacquired error. For this:

1. Go to Steam and click on Settings from the top.

2. Go to the Downloads tab and then click on ‘CLEAR DOWNLOAD CACHE’ and then click on ‘Ok’.

3. Once the process completes, restart Steam, and then relaunch the game. The issue should be fixed now.

2. Uncheck DLCs That Don’t Have File Size

This is also a potential solution to fix Modern Warfare 2 33/39/45 files that failed to validate and will be reacquired issue. To do this:

1. Open up Steam, right-click on the game, and select ‘Properties’ 

2. Go to the DLC tab

3. Here you will see some files that don’t have file size written next to the name

4. Simply uncheck those files 

5. Once done, launch the game and you are good to go

3. Verify the Integrity of Game Files

Verifying the integrity of game files fixes the missing or corrupted game files so if the above method doesn’t work, then try this solution. For this:

– Go to Steam Library

– Right-click on Modern Warfare 2 and click on Properties

– In a newly opened dialogue box, select Local Files 

– And click on Verify the Integrity of Game Files

– Once done, relaunch the game and the error should be fixed

4. Delete the Save Game Files

The last resort is to delete the saved game files but remember, this will remove all your game progress. To do this:

1. Open up File Explorer on your computer

2. Then go to Documents 

3. Find the ‘Call of Duty folder and right-click on it

4. Select Delete

5. Once deleted, launch the game

That’s all for this guide on how to fix CoD Modern Warfare 2 33/39/45 files that failed to validate & will be reacquired.

Read more: How to fix Modern Warfare 2 server is not available due to multiple logins error.

Update 30 Oct: Fix Files Corrupted Couldn’t Verify or Failed to Validate

Several issues are plaguing players who bought Modern Warfare 2 when they try to play the campaign mode of the game. In this guide, we shall discuss the error in which users see 18 files corrupted, couldn’t verify, and how to fix it. The following fixes have been sourced from the community and forums so try all of them even if one did not work for you.

The Cause of the Error

The cause of seeing this error ‘18 files corrupted, couldn’t verify’ is that the game files have for some reason gone bad. This can be for a variety of reasons, ranging from your antivirus to an outdated BIOS. But you do not have to worry as we will be listing each and every fix that we could find for you. Keep reading till the end to find out.

How to Fix Modern Warfare 2 18/24/33/39/45 Files Corrupted Couldn’t Verify

The following are the various fixes that you can perform to fix this bug in Modern Warfare II. We suggest that you try each fix in the order that they are listed:


We think that the reason for the MW2 18 files corrupted bug is your antivirus or windows defender mistook the files for malware or virus and kept deleting them. A user confirmed our theory on our YouTube channel as he successfully fixed the issue after disabling the Windows Defender.

So, you should first disable the Windows Defender or any other antivirus you may have. Once that’s done, download the game. After that, set exclusion for the game folder and the game executable on your Windows Defender and Antivirus.

To check the fix, start by disabling Windows Defender (do not disable the antivirus permanently, or your security may be at risk.) To perform the fix, search for Windows Defender in the Windows Search, and on the left bar, you should see the option to disable it. If you use a third-party antivirus, do the same for it.

After downloading the game, set an exception. You can learn more about setting exceptions in this post. If this fix did not work for you, move on to the next one.

Quick Fixes

The following are short quick fixes that you can try:

  • Restart Steam and then verify the integrity of the game files. (click on this link to find out how to do it)
  • Update Windows to the latest version and then perform the previous step again.
  • Perform a clean boot.
  • Update the BIOS of your system.
  • Perform a fresh installation of your Graphic Card drivers. (Nvidia and AMD)
  • Uninstall the game and reinstall it in the drive where Steam is installed. (C Drive by default)
  • Disable XMP in the BIOS settings.
Disable Services

One user reported that the following fix worked for them:

  • Open the “System Configuration” menu by typing it into the search
  • Select the “Services” tab.
  • Select “Hide all Microsoft services” to conceal all Microsoft essential services.
  • Instead of clicking the “Disable all” option, you should only leave the checkboxes for apps that came with your PC
  • Select “Apply,” then reboot your computer.
Adjust Virtual Memory

1. Go to System>Settings>Advanced

2. Change the setting of the paging file for all drives.

3. Choose the drive in which the game is installed

4. Enter the custom size.

To calculate the custom size for your system:

For Initial Size, RAM size x 1.5 [add 2 zeroes after the result] (Example: 16GB RAM x1.5 = 2400)

For Max Size, Initial Size x 3 (Example: 2400 x 3= 7200).

Story Mode Fix

A user submitted this fix in a forum, we have yet to verify if it actually works, but there is no harm in trying it out.

The user was facing this issue when playing Mission 11 and trying to storm a room for the boss. They noticed that when they killed an NPC on the 2nd Floor to get the pass card, the NPC respawned in the next room for some unknown reason. They said that this was causing the issue for them. They restarted the mission and did not kill the NPC. Instead, they used the roof to enter the room and have not faced any issues after that.

That was all for this guide on how to fix Modern Warfare II 18 files corrupted couldn’t verify. If you are interested to read more COD content, click here. We shall be updating this article as soon as we find more fixes so be sure to check again. Thank you for reading this article.

Prasiddh Thakkar

I am a trainee at QM Games.

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