Most of the times this issue occurs after a fresh/clean installation of Windows 7.Many users have reported that they even waited for more than 24 hours but Windows Update just stuck at "Checking for updates" status and they couldn't install any update in their computers.[Update: April 11, 2017]: Windows 10 Creators Update has now started to roll out for everyone.However, as previously reported the update will be released in multiple phases, meaning you might not get it for a few weeks or even months. Follow this guide to install Windows 10 with the very easy-to-use Update Assistant.
The progress bar keeps showing progress animation which makes you think that Windows Update is doing something but even after waiting for hours, nothing happens.
You will have the ability to specify a time that is convenient for you, snooze pending updates for a few days, and expand the “active hours” time window during which you don’t want to be disturbed by an update. Manually update via the Software Download Site As an advanced user, you have two manual installation options.
The recommended method is to utilize the Update Assistant.
If you're still within this 30-day window, you can get the Anniversary Update right now by deleting the folder with Disk Cleanup.
Once you delete the folder, you can manually prompt Windows Update to download the Anniversary Update.