Unable to use Windows Update

Question

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.

Answer 1

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).

Answer 2

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.

Answer 3

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 :)