Svchost using 50% CPU when idle

Hi and welcome to SevenForums,
Yep it's been a popular occurrence lately,
All I can say is make sure you have the latest Net framework 4.6.1 installed do it manually if not
https://www.microsoft.com/en-us/down....aspx?id=49982

And the most recent update client
https://support.microsoft.com/en-us/kb/3138612

Hi,
If you're not sure how to check to see if Net framework 4.6.1 is installed already it will be listed in Uninstall a program if it is along with which ever version is installed.

Hi,
Well if you do clean install there is a sort of convoluted process to follow otherwise you won't be any better off than now
Before you start download KB3083710 and KB3102810 in advance, and store them on a flash drive
Start and complete the install without an internet connection
Immediately after install is complete
Manually install KB3083710 and restart.
Manually install KB3102810 and restart.
Change your windows update settings I used Check for updates but let me decide when to download and install
Unchecked Give me recommended updates the same....

Restore the Internet connection and Activate windows
Then launch Windows Update search
After about 5-10 minutes you should have plenty of updates to download and install.

Another thing is if you see this update make sure it is not installed with any other updates
It needs to be installed all by it's self
It was not uncheck automatically which caused many others to fail to install
https://support.microsoft.com/en-us/kb/3020369

Hi,
Yea I had the same thing happening on a dual core 32 bit laptop with the high cpu usage came high temperatures
I had no choice
I had a spare ssd same size and just did it = dang if it didn't solve the problem :)

I believe it's a corrupt updates store
Run sfc /scannow three times in a row restarting between each rerun
Click Start and type in the search box
cmd
Right click the suggestion on the top and run as administrator
Then type
sfc /scannow
Then the enter key.
Yes there is a space between the c /
When the scan is done type
exit.
Restart the machine and repeat 2 more times.

Then if you feel up to it as a last resort before a clean install :)
Use winkey+R
Type in the Run box,
eventvwr
Windows logs on the left column and expanded them and right click and click on clear on the 4 entries below,
Applications
Security
Setup
System
Exit and restart the machine again

Make sure the services are running and hurry up and wait
https://support.microsoft.com/en-us/kb/971033

Then click Start and type in the search box
services
Click the suggestion or the enter key
Make sure these services are running and on automatic or delayed start.
Double click the listings to get the options to change them.
Background intelligent transfer services
Cryptographic
Windows installer
Windows update

You could also let Brink do it for you
This does about the same thing
Windows Update - Reset

Also maybe check the posts here and the links mentioned:

Windows Update checking for updates forever

As for Brink's script also read here:

Windows 7 Updates Searching for updates Forever

ThrashZone's point about "no inteternet connection" is a good one. Personally I have found that it's the windows update check that is the problem. It's better after applying fixes to:

Not allow any connection unless you have disabled Windows Update Service.

Once disabled reboot and connect if you want to.

Wait 24 hours (until after the next scheduled update check) before re-enabling Windows Update Service then re-apply Windows Update setings. Contrlo Panel> Windows Update> Change Settings.

Configure to notify but not download.

Reboot then run an update check. The first one may take a long time as the system is re-scanned. It might take hours.

Subsequent checks should work faster.