Take the 2-minute tour ×
Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

I have a Windows 7 Home Premium 64-Bit installation where Windows Update has stopped working for no apparent reason.

6 new important updates are listed as available. No matter whether I try to install all of them or just a subset, it always goes like so:

  1. Updates are being downloaded.
  2. One update after the other is reported as being installed. ("Update x of n is being installed ...")
  3. After the last update has been "installed", the Windows Update icon turns red and it is stated that none of the updates were installed. (I.e. if I tried to install 6 updates, it says "6 updates failed to install.". An error code of 80071A91 is reported.

When googling for this error code, I found advice to delete files in %windir%\system32\config\txr and %windir%\system32\SMI\Store\Machine. Unfortunately, this didn't help.

What can I do? Any log file I can check?

share|improve this question
add comment

3 Answers

up vote 2 down vote accepted

How-to reset the File System Resource Manager if you receive error 0x80071A91

  1. Click Start click All Programs click Accessories, right-click Command Prompt, and select Run as administrator.
  2. In the Command Prompt window you will need to type the following: fsutil resource setautoreset true C:\ and press ENTER

  3. Note: You will need to replace the C:\ with the drive letter that Windows 7 is installed on.

  4. Restart your computer, and then attempt to install the failed update(s).

As always you can try the Microsoft FixIt Tool.

share|improve this answer
    
I already tried that numerous times, to not effect. –  tajmahal Dec 25 '12 at 21:44
    
Check updated post –  James Young Dec 25 '12 at 21:46
    
I tried this FixIt tool. It didn't work either. It said it fixed it, but it didn't. –  tajmahal Dec 25 '12 at 21:46
    
Read this, sevenforums.com/windows-updates-activation/… –  James Young Dec 25 '12 at 21:48
1  
Doing a repair install (upgrade install) actually fixed the problem. I would have wished for a method less brutal to work, but that was the only measure that helped. I'll mark this answer as accepted because the discussion with @James Young (in chat) lead me to finally perform a repair install. Thanks again! –  tajmahal Dec 27 '12 at 14:45
show 6 more comments

Try installing them one at a time, starting with the oldest (lowest numbered). Sometimes updates can conflict, both trying to update the same files, causing them to fail.

share|improve this answer
    
I also tried that. Did not work. –  tajmahal Dec 25 '12 at 21:44
    
Did you reboot after each one (even if it didn't ask)? –  Nicole Hamilton Dec 25 '12 at 21:57
    
I tried both with and without rebooting. It didn't want to install a single one of them. I guess I have rebooted this machine aprox. 50 times today while trying to figure out the problem :-) –  tajmahal Dec 25 '12 at 22:10
add comment

Another possible strategy is suggested by dockster in sevenforums:

1) Turn Windows Features On/Off --> Uncheck .Net Framework 3.5
2) Run Windows Update Reset Tool (Fix it) [Check "Aggressive Mode"] Article
3) Run .Net Cleanup Tool Article
4) In an elevated command prompt, execute (Article):

   1. Bring up an elevated (Administrator) command prompt
   2. Execute the following commands sequentially:
      a. fsutil resource setautoreset true c:\
      b. cd %windir%\system32\config\txr 
      c. attrib -r -s -h *
      d. del *
   3.Type: Cd c:\windows\System32\SMI\Store\Machine
     Type: Attrib –a –h –s *.TM*
     Type: Del *.TM*
     *** You may get access denied errors -- its ok for now ***

5) Restart in Safe Mode with Command Prompt. Redo the steps above in BOLD. Some files still will not delete. That's fine.
6) Restart in Normal Mode - run windows update with success.
share|improve this answer
    
I have already done that, to no effect. –  tajmahal Dec 25 '12 at 22:46
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.