Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Updates fail, errors I get:

Error details: Code 643, Code 80070026, Code 800700C1

Here are the updates I try to install:

  • KB2518870
  • KB2572078
  • KB2633870
  • KB2656351
  • KB2570947
  • KB2468871
  • KB2533523

I tried googling for these errors but haven't found any certain answers. I thought perhaps the experts here in superuser might be of help.

share|improve this question
Can you install just one of those updates? – Moab Apr 1 '12 at 20:46

According to a post here you might want to try turning off your anti-virus, and performing a clean boot (i.e. disable all programs and all non-Microsoft services at boot).

share|improve this answer
Nope :( that didn't solve my issue. – Shimmy Apr 1 '12 at 18:59

Enter the following three commands from an elevated command prompt:

net stop wuauserv
rmdir /s %windir%\SoftwareDistribution\WUredir
net start wuauserv

You can also do the same thing from the services control panel and by deleting (or renaming) the directory from Explorer.

share|improve this answer
I tried it and it didn't help. – Shimmy Apr 1 '12 at 19:42
Try deleting the entire SoftwareDistribution folder. – Moab Apr 1 '12 at 20:46

You might try, after deleting the SoftwareDistribution, to install those updates manually via command line. Two ways:

  • with wuauclt (built-in, but i dont know how to select a specific update. if it is even possible?)
  • with wuinstall (third party tool, but it uses the windows update api)

for example the command for installing the first mentioned update:

wuinstall.exe /install /match KB2518870

if both ways are still not working, you might update your windows update :)

share|improve this answer

Your Answer


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.