Low Disk Space Message Killer

"Low disk space" messages were implemented by Microsoft to notify users when their computers are running low on disk space on the primary partition where Windows is installed (typically C:).

How "Low disk space" alerts work

Moving or deleting files to make room for new data is necessary not only for personal files but also for the operating system, which requires free space to continue working within normal parameters and to ensure reliability.
These messages regularly pop up from the system tray (notification area on the bottom-right corner of the screen) when you have only 200MB, 80MB and 50MB free space remaining.
For example, if you have below 80MB left, it will not be possible to run System Restore. When you reach the 50MB threshold, System Restore will stop monitoring the PC because there isn't enough free disk space available.

Disable "Low disk space" popup messages

However, if you wish to ignore "Low disk space" alerts, you can resort to Low Disk Space Message Killer, a simple application that performs the necessary registry tweaks to deactivate these Microsoft alerts when you reach the 200MB, 80MB and 50MB thresholds. You just have to run the downloaded setup file, as the lightweight tool handles the rest.

Cannot undo changes using this app

On the other hand, you should know that the developer hasn't integrated options for undoing this modification, so it's not possible to reactivate "Low disk space" messages by just clicking a button. This can be done by finding and installing another application or by manually tweaking the system registry settings.

How to manually undo modifications using Regedit

What Low Disk Space Message Killer does is access Registry Editor (Regedit), goes to HKEY_CURRENT_USERSoftwareMicrosoft WindowsCurrentVersionPoliciesExplorer, creates a new value called "DWORD", names it "NoLowDiscSpaceChecks" and sets its value to 1.
It may be necessary to restart the PC to commit modifications. If you want to undo changes to restart the "Low disk space" message, just follow these steps in the Registry Editor to delete "NoLowDiscSpaceChecks".