Precondition Assertion Failed

http://support.steampowered.com/cgi-bin/steampowered.cfg/php/enduser/std_adp.php?p_faqid=31

Related Error Messages

  PreCondition Assertion Failed
  Name:<varies - see below for specific messages>
  Name: ValidPositiveOffset 
  Name: EntryIndexInBounds 
  Name: InRecvMsgData state 
  Program:C:\Program Files\Steam\Steam.exe
  File:<varies>
  Line:<varies>

  <varies>

  (Press Retry to debug the Application - JIT debugging must be enabled)

Name: ValidPositiveOffset

  PreCondition Assertion Failed

  Name: ValidPositiveOffset
  Program: C:\Steam\steam.exe
  File: Src\SplitPath.cpp
  Line: 310

  ( !(nCharsToMove >= 0) || (m_uLocalPathOffset+static_cast(nCharsToMove) <= m_sPath.length()) )
  (Press Retry to debug the Application - JIT debugging must be enabled)

This issue is caused by the Unerase Wizard component of Norton Systemworks 2008 (prior versions will not generate this error).

If you would like to disable the Unerase Wizard component, please follow the steps below:

1. Exit Steam
2. Go to the Start button
3. Select the Control Panel option
4. Open Norton SystemWorks 2008
5. Select Remove then Modify
6. Select Customize Norton Utilities
7. Uncheck the box for Unerase Wizard
8. Click the OK button, then click Next to uninstall the component
9. Reboot your machine and restart Steam

Name: EntryIndexInBounds

  PreCondition Assertion Failed

  Name: EntryIndexInBounds
  Program: C:\Program Files\Valve\Steam\Steam.exe
  File: Src\ChcheFileFixedDirectory.cpp
  Line: 755

  uEntry < m_uMaxEntries
  (Press Retry to debug the Application - JIT debugging must be enabled)

This specific error message indicates a damaged file in your /SteamApps/ folder.

To correct this issue, please follow the instructions below:

1. Exit from Steam if it's running
2. Rename the /SteamApps/ folder (located under C:\Program Files\Valve\Steam\ by default) to ~SteamApps
3. Run Steam and let it update the platform files
4. If that all works, then exit from Steam again, and move back just the game cache files one at a time
5. Don't replace anything that is already in the /SteamApps/ folder
6. If the error comes back then the last GCF file you moved is the problem, exit Steam and delete that file
7. Finally, move your account directory and the rest of your game folders back
8. Once you have confirmed that the issue has been resolved, you may delete the /~SteamApps/ folder

Name: InRecvMsgData state

  PreCondition Assertion Failed

  Name: InRecvMsgData state
  Program: C:\program files\Valve\Steam\Steam.exe
  File: Src\CSClientConnection.cpp
  Line: 1769

  m_CurRecvState == eRecvMsgData
  (Press Retry to debug the application - JIT debugging must be enabled)

If you receive this error there is a very good chance you have a program like BitDefender running which has hooked your internet connection.

You won't be able to disable this program. You will need to uninstall it completely and reboot in order to fix this problem.