Windows 7 Updates not downloading.

This sounds like the same problem I'm having right now (it started a month ago for me too). wuauserv is going crazy on my machine, running the **** out of my CPU, meanwhile Windows Update continues "checking for updates" forever.

Disable Windows Update. BOOM. Problem solved. :\

Windows 10 update is not forced, is optional, except that you have opened GWX and confirmed (by mistake) the installation button that says something like: "not for now but later".

now about Windows Update... maybe you have corrupted Windows Update folders, try use my tool to fix that first (run as admin): http://www74.zippyshare.com/v/J62uSUSQ/file.html 

also try this: http://go.microsoft.com/?linkid=9830262

That 3138612 update is probably installed for most users, it's from March 2016. I also have it, but Windows update got stuck again. It's strange how Windows update never had problems until recently when Microsoft is running out of time with Windows 10 forced update. You need to fix your own problems Microsoft, rather than let users try to figure out what is broken this time. Hire some actual programmers to help with important stuff.

if Windows 7 have troubles to find updates, causing high CPU or RAM usage with the process Svchost.exe, it is due that Windows Update was not able to update automatically the Windows Update Client.

in this case, you need to download the update manually, this is the most recent version for now: https://support.microsoft.com/en-us/kb/3138612

Note: if you have troubles to install this update, stop "Windows Update" service, and fastly try to install the update.

We are well over 10 minutes and nothing has changed.  Still checking for updates.