How can I get rid of pop-up at bottom of screen?

A little popup that appears in the lower left corner of your Hitachi smart TV screen may be related to one of the TV's settings or capabilities. You can attempt the following actions to get rid of it:

1.Investigate notifications:

Smart TVs occasionally show notifications for different events or upgrades. If there are any notifications, look for them and then clear them by following the on-screen directions.
2.Applications and Inputs:

Make sure all programmes and inputs are closed. The popup may occasionally be connected to an input source or app, which can be closed to get rid of it.
3.On-Screen Display (OSD) Off:
There might be an OSD option in the settings menu on Hitachi TVs. Try disabling OSD or changing its settings to see if it gets rid of the popup.
Verify any software/firmware updates:

4.Make that the most recent firmware or software upgrades are installed on your TV. Pop-up windows may appear as a result of faults in outdated software. Look for a software update option in the TV's settings menu.
5.Firmware Reset:
You can conduct a factory reset on your TV if the problem persists after you've tried various troubleshooting measures. The default values for all settings will be restored as a result. Make cautious to back up any crucial data before doing a factory reset because doing so will also remove any customised settings and data.
6.Message Hitachi Support here:
If none of the aforementioned fixes the problem, it's a good idea to get in touch with Hitachi customer service or refer to the TV's user manual for detailed instructions on how to get rid of the popup.
Regarding External Devices:

7.The popup may be related to any external devices you have connected to your TV, like a cable box or game console. Make sure that these gadgets are operating properly and that the settings have been changed as necessary.
Keep in mind that depending on the type and software version of your Hitachi smart TV, the precise processes and options may change. For instructions unique to your TV model, consult the user manual, or go to the Hitachi website for further help options.

Turn off the wifi or unplug the Ethernet and it may do the trick.

There can be a million different popups in Win7... and a thousand ways to get rid of them.
Can you post a screen shot of the popup you're trying to get rid of?

If you are using Internet Explorer select tools then popup blocker and then turn on popup blocker.

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Download and install Malwarebytes from here:
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Run Malwarebytes and it should get rid of that pest for you.

try bringing up the menu, and see if there's an option "factory default", and try that. you didn't mention what button on the remote you press to get rid of the popup, or what feature you are turning off to get rid of the popup,