‘Preferences’ are settings that are user dependant. The user can choose what suits him/her best, for example:

• Units and decimals,
• The language
• …

At the first startup of ConCrete, ConCrete takes the default values (stored in the Program Files). When you work with ConCrete, you will customize these settings along the way.

Solution 1

• Close all ConCrete and ConCrete Plus projects.
  Even if you get an error on launching ConCrete (Plus), use the Taskmanager to close ConCrete (Plus).
  Don’t skip this step!
• Go to C:\Users\**YourUsername**\AppData\Local\VirtualStore\Program Files (x86)\BuildSoft\ConCrete
  The folder ‘AppData’ is a hidden folder. You can show the hidden folders using the folder options.
  If the folder is empty or doesn’t exist, go to Solution 2.
  
• Delete the content of this folder.
  Warning: if you want to keep the defined hollow core slabs (HCS), copy the file CONCRETE_7.PRF to your desktop before deleting. Read about Restoring the HCS library after resetting the ConCrete preferences
• Restart ConCrete.
  Trouble finding the hollow core slab license? The solution is here.

Solution 2

In some cases, the preferences are not stored in the folder C:\Users\**YourUsername**\AppData\Local\VirtualStore\Program Files (x86)\BuildSoft\ConCrete, but in the folder C:\Program Files (x86)\BuildSoft\ConCrete\.

• Close all ConCrete and ConCrete Plus projects.
  Even if you get an error on launching ConCrete (Plus), use the Taskmanager to close ConCrete (Plus).
  Don’t skip this step!
• Go to C:\Program Files (x86)\BuildSoft\ConCrete\
• Sort the content of this folder by date.
  The preferences usually have the same date and a more recent date than the rest of the files in that folder.
  Depening on which features of ConCrete (Plus) you’ve used, you’ll obtain more/less preferences. The name of the preference-files is the same as in the printscreen at Solution 1.
• Select the preferences and hit delete.