‘Cyclic Redundancy Error’ is usually caused by a registry issue can usually be fixed with a registry scan. But just in case you can always try these solutions. Which also can lead you to getting a ‘Disc Authorization Error’.

You will want to attempt a hard drive installation of the game. In this process, you copy the game files to the Desktop, so that the disk, although necessary for running the game, is not necessary for installation.
1. Right-click the Desktop, select New, and select Folder.
2. Insert the Install Disk into the drive.
3. Exit any auto-play screen that may appear.
4. Open My Computer.
5. Right-click the CD-ROM drive containing the Install Disk and select Open.
6. Click Edit at the top of the window.
7. Click Select All.
8. Click Edit again.
9. Click Copy.
10. Close the window.
11. Right-click the New Folder on your desktop and select Paste. (The game files will now copy.)
12. Once the files from the Install Disk are copied proceed to step 13.
13. Upon completion, remove all disks from any drives.
14. Double-click the Setup folder.
15. Double-click on the Sims3Setup.exe icon, looks like two silver arrows and a half-circle on a blue background. (The installation should now begin.)

2. If you got Sims 3 CRC Error then there is a 94% chance that your computer has registry problems. To repair Sims 3 CRC error you need to follow the steps below:

Download a Perfect Optimizer,install this error repair tool.
Click the Repair All Button.It will scan you PC for Free.
Then click the Repair All Button again and your done! It is very easy to repair Sims 3 CRC error.
3. Download EA download manager [EADM], create an account on there, then you get your serial key for the game, type it in EA download manager and it will download the game and install. A CRC error is the DVD Drive not being able to read the disc properly. It downloads pretty quick. and anyone else who is having this problem this is the way around. All you need to do is have an EA account set up, then there is a tab that says activation, this is where the serial key goes, and its that simple.

4. Run the Windows Defragmenter software on your system. Fragmented hard disk space can cause this error.

CRC errors may also be caused by a hard disk or DVD drive failing or being unable to write consistent data.

If you have run the Defragmenter software and are continuing to experience this error, please contact your system’s manufacturer for further diagnostics.

It appears that in some cases, users that are using the EA download Manager version of The Sims 3 may experience this error if their download is paused. To resolve this issue, perform the following steps:

Log in to the EADM.
Click on the red x in the upper right part of the Sims 3 download to clear the EADM cache.
Re-download The Sims 3; do not pause the download.

What steps can I take to attempt to correct a 'Disc Authentication Error'?


The 'Disc read authorization' or 'disc read authentication' error is oftentimes caused by the existence of Drive Letter Access (DLA) software on your machince. DLA software includes DVD recording applications with the ability to drag and drop files directly to a drive letter, such as Sonic or Roxio. These applications are known to cause disc authentication problems. To fix this issue, try the troubleshooting steps below:

Click on the 'Start' menu on the Windows Taskbar.
Click on 'My Computer.'
Right-click on the DVD drive letter you are using to run your game.
Select 'Properties' from the list of options.
You should see a 'DLA' tab in the Properties panel, where you can disable the DLA software on your machine.
If disabling the DLA software from the Properties panel does not solve your issue, you can also try to update the drivers for your DLA software through the manufacturer's website.

If updating your drivers still causes you to get the 'disc read authentication' error, you might want to completely uninstall your DLA software using the 'Add or Remove Programs' tool in the Control Panel.

Update: Many of the reports we have received regarding this issue all list the 'MATSHITA DVD-RAM UJ-841S' as the existing DVD drive in affected systems. The Matshita drive is usually found in Toshiba laptops. We recommend checking the Toshiba and/or Matshita support websites in order to find a more targeted solution to this issue.

You might also want to consider updating your Toshiba drivers by visiting this site and selecting your machine's make and model.

List of conflicting software

The following applications contain conflicting DLA software. Many users have been able to clear this error by uninstalling these applications:

Paragon NTFS
Metakine DVD Remaster
Roxio Creator

Mac-specific Troubleshooting

Disconnect any iPods, iPhones, iPads or External Drives

If you encounter the 'Disc Authentication' error on a Mac, try ejecting any external storage devices hooked up to your machine before restarting your system and launching the game. External storage devices include:

iPods
iPhones
External Hard Drives (either USB or Firewire)
Be sure not to disconnect these devices before ejecting them safely. Also, make sure you completely quit out of iTunes after you eject your iPod or iPhone. Press the Command/Apple key and the 'Q' key while in iTunes to quit the application completely. Pressing the red 'X' button does not quit the application.

Delete your Cookie.plist file

To delete your Cookie.plist file, follow the steps below:

Make sure you are logged in with a user that has admin privileges.
Double-click on your Mac Hard Drive icon, you should now see a Finder window.
Click on User.
Make sure you select a user with admin privileges.
Open Library.
Open Cookies.
Find the Cookies.plist icon and delete it. This will send the Cookies.plist file to the trash.
Empty the Trash.
Hold down the power button for 10 seconds.
Restart your Mac

Further Troubleshooting

CD Emulation software is also known to cause similar issues with disc authentication. Below is a list of software that is known as, or known to include, CD Emulation Software that could potentially prevent the game from playing properly:

Fantom CD Emulator
Alcohol 120%
Nero Image Drive
Phantom CD
Clone CD
Ark Virtual Drive
Veritas DLA
Daemon Tools
If you are unsure about how to turn off emulation settings, consult your emulation program help files. If you have emulation software not listed above that does not provide adequate information about how to turn off emulation to avoid software conflicts, then uninstall the software from your machine.

If this does not resolve the issue, please create an incident using the Email Us link on the left, and attach the following files:

A Dxdiag file (Submitting a DirectX Diagnostic File)
A 'devicefailure.log' file, which you can obtain using the following instructions:
Click My Documents
Click Electronic Arts
Click Sims 3
Right-Click on the 'devicefailure.log' file and select Copy
Right-Click on your desktop and select Paste

If Alcohol 120% is on the machine:

Start Alcohol 120% and go to the Emulation Options.



Select Emulation from the options tree. Uncheck the Ignore Media Types box to turn off the media type emulation, exit Alcohol 120%, and restart the game application.



Select Extra Emulation from the options tree. Uncheck the BAD Sectors Emulation to turn off this type of emulation, exit Alcohol 120%, and restart the game.



If CloneCD is on the machine:

Look on your task bar at the bottom right of your screen (next to the clock). Locate the CloneCD tray icon, which can be a picture of two CD-ROMs; or of a sheep's head . Right-click the icon and make sure Hide CD-R media is un-checked. Restart the game application.
If Daemon Tools is on the machine:

Select the icon at the bottom of the status bar of windows.
Find the Daemon Tools Icon
Right Click on the Daemon Tools icon in the Task Bar.
Select the Emulation tab.
Deselect SafeDisc.