Event Viewer keeps track of activity for better management.
However, if the upper limit of the security log is reached, no more events can be logged.
Event ID 1104: The security log on this system is full.

When that happens, only administrators can sign in.
In this guide, we will show you a bunch of solutions on how to address the problem.
Without further ado, lets jump into it right now.

It will save the memory and prevent it from getting full.
To do so:
Step 1.
Typeevent viewerin the search bar and hitEnter.

In the right pane, right-click onPropertiesunderActions.
TickOverwrite events as needed (oldest events first)and hitOKto save the changes.
Right-press thestarticon and selectRunfrom the quick menu.
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Typeservices.mscand hitEnterto open Services.
Scroll down to findWindows Event Logand right-hit it to selectRestart.
Click onApply&OKto save the changes.

Go toUpdate & Security>Windows Update>View update history.
HitUninstall updatesand right-press the recently installed update to chooseUpdate.
Fix 4: Run System File Checker
Step 1.
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Typecmdin the search bar to locateCommand Promptand right-hit it to chooseRun as administrator.
In the command window, typesfc /scannowand hitEnterto start the scanning.