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Windows 7: windows update takes 25% of the cpu since today :(

13 Jul 2016   #1

windows 7 64 bits sp1
windows update takes 25% of the cpu since today :(

Hello, today i found that at idle my cpu was at 25%-27% whereas before it would be at a few %..

i checked the ressource monitor and it shows that svchost.exe (netsvc) takes 25%...

I tried to look up the services in task manger and it shows several like : Aelookupscv, Browser, EapHost ,gpscv, Lanmanserveriphlpsvc, Profsvc,SENS, ShellHWdetection, Themes, Winmgmt, wuauserv.

i tried to desactivate wuauserv (windows update) and the cpu went back to normal....

Today is the day i get new updates but this cpu thing never happened before and usually i can see that i have updates available later in the day just when i check windows update (Then, when i click to download the updates i chose, my cpu usage goes up, i wait like 1 hour or 10 minutes and the updates are downloaded and installed).

But it didn't seem windows update was busy when i checked it ( it said no updates available) and the cpu was still at 25%..
Windows update is configured to "let me check to download the updates".

so what should i do? let things like that and reactivate windows update later in the day? Is it dangerous to let windows update off like i did?
Did i screw up my windows update by disabling the service wuauserv ?

THank you for your time

edit : i just checked windows update and it just said that no updates were avalaible to me. The cpu went back up (without any sings of windows update working) so i turned off wuaserv again to get rid of this cpu usage...

Also i have a question : if i click on "check for updates" will it try to search for all the updates that i hide? Or just the new ones? because i selected updates since january..

My System SpecsSystem Spec
13 Jul 2016   #2

Windows 7 Home Premium 64

It is normal for wuauserv to take up 25-50-100 percent when searching for updates.

The problem is when it does this for hours and never stops, just keeps searching.

Is that your case? Was everything fine until yesterday? Did it search for updates and came up with results in few minutes?

If it was all good until recently and now it's stuck, you can try this:

Set Windows to Never check for updates.

Make sure wuauserv is not taking 25 percent of the cpu. If it does, just stop the service.

Download and install KB3168965.

Restart and set Windows to Check for updates but let me choose what to install.

Search for updates.
My System SpecsSystem Spec
13 Jul 2016   #3

windows 7 64 bits sp1

I believe it wasn't searching for updates
When it searches for update, you see it ("searching for updates") in the windows update window, right? But in this case windows update wasn't doing anything it seemed. Maybe i should have let it run a bit longer? it had been 2 hours since i booted the computer.

Right now if i check my windows update, the wuauserv is reactivated and the cpu goes to 25% but windows update doesn't seem to do anything (it is almost the time of the day when i can see the monthly updates ): i just see one update is availaible (the silverlight update that came a little earlier this month and that i haven't hide) on the menu but no sign of working.

The fact that this happens right at the day when usually my computers finds the monthly updates could be a reason for this?

Regarding your method, when i click "search for updates" will it try to gather all the updates i ignored and take a long time or will it just check the new ones ?
i might do that after i will try to install the monthly updates. Usually i do it the day after i can see them (thursday) so i can see if people have problems on some.
thank you for your answer :)
My System SpecsSystem Spec

13 Jul 2016   #4

Windows 7 x64

Have you do a google search "svchost.exe"

One of the result:
What is svchost.exe And Why Is It Running?

Do read and understand on this svchost.exe

As for the windows update, it is better to use the Recommended choice.
If not your windows may have problems later.
Such as important updates.
As far as i understand, using this method; do not mean always checking for windows updates.
My System SpecsSystem Spec
13 Jul 2016   #5

Windows 7 Home Premium 64

Not sure I understand your problem correctly.

You search for updates, searching completes with finding only Silverlight update and nothing else? And wuauserv still at 25 percent after search is complete?

Please do this - restart, then click search for updates. Allow 1-2 hours and please post a printscreen of the found updates.
My System SpecsSystem Spec
13 Jul 2016   #6

windows 7 64 bits sp1

Sorry if i'm not clear
I wasn't looking for updates, i just found that my computer at idles used 25% cpu which i could "solve" by disabling windows update (right click in the wuaserv service in the task manager).then cpu went back to normal.

Usually i never need to click the "search for updates" as it seems to find them suddenly and propose them to me in wednesday evening each month of the "updates day".

When i checked again windows update (by clicking on its icon on the config panel) , it just showed me a "normal windows update screen" with the silverlight update that was there since 10 days ( i didn't want to install it) without searching. i could have clicked "check for updates but i didn't and checked the cpu : 25%.which means that even while not searching windows update took too much cpu. (uaserv was back again of course in the task manager).

im going to do what you said; i clicked search for updates
My System SpecsSystem Spec
13 Jul 2016   #7

Windows 7 Home Premium 64

Did you get a result? Or still searching?

If still searching, try the method i wrote above and hopefully it will solve your problem.
My System SpecsSystem Spec
13 Jul 2016   #8

windows 7 64 bits sp1

it is still searching and i have a feeling it could stay like this for long
the cpu usage didn't even go up from 25-27% when i clicked "search for updates", it stayed the same.

Setting windows update to "never check for updates" the cpu is still at 25%.. and windows updates keeps searching (it didn't interrupt the search). i had to stop the service as you wrote to get normal cpu usage.

Is KB3168965 the security updates of this month?

I also read about installing offline kb3102810 and reboot and check for updates...

which one should i do first? thank you for your help :)
My System SpecsSystem Spec
13 Jul 2016   #9

Windows 7 Home Premium 64

It won't stop the search. You need to either restart and make sure it's stopped, or stop it yourself manually. Then set to "never check for updates", download and install. Every month lately when they release new updates, searches are very slow. This month's update that makes searches faster is the one I said. I can't guarantee it will work for you. For me it worked today. After searching for 5 hours for updates, I gave up, installed the update ending in 965, then in 5 mins it found the updates.
My System SpecsSystem Spec
13 Jul 2016   #10

windows 7 64 bits sp1

thank you; i think will do this tomorrow it's getting late and i prefer to do this with a fresh state of mind.

It's weird because for me it never really took that much time to find the updates; at most like 45 minutes and everything would go well.
And then suddenly today i get this problem^^
My System SpecsSystem Spec

 windows update takes 25% of the cpu since today :(

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