Error 0x80004002

If you seeing the following errors in "%Windir%\WindowsUpdate.log".

FATAL: Failed to get session from datastore, error = 0x80004002
FATAL: Failed to Unserialize from data store, error = 0x80004002
WARNING: Exit code = 0x80004002
WARNING: InitAUComponents Failed, will restart AU in 30 mins, error = 0x80004002
DnldMgr FATAL: DM:CAgentDownloadManager::CheckAllCallDownloadStates: GetSession failed with 0x80004002.

Try the following steps:

Rename/Delete "%Windir%\WindowsUpdate.log" before you start to see the latest detection.

1. If you have a proxy server -

• Stop Automatic Update Service - "Net stop wuauserv".
• Run the following command: "proxycfg.exe -u". 
• Start Automatic Update Service - "Net start wuauserv".
• Force update detection and see if that works.

2. Re-create the Datastore -

• Stop Automatic Update Service - "Net stop wuauserv".
• Rename/delete "%Windir%\SoftwareDistribution" folder. 
• Start Automatic Update Service - "Net start wuauserv".
• Force update detection and see if that works.

3. Try to force install WUA.

• Download WUA WindowsUpdateAgent20-x86.exe from http://go.microsoft.com/fwlink/?LinkId=43264.
• and run the following command: "WindowsUpdateAgent20-x86.exe /wuforce".
  
  
  If nothing works you can always post your results from "%Windir%\WindowsUpdate.log" on microsoft.public.windows.server.update_services .