Windows command guide
How to Open Reliability Monitor with perfmon /rel
Reliability Monitor is useful because it shows a timeline of crashes, failed updates, and repeated software problems. That makes it easier to choose a better repair path instead of guessing.
This guide is written around the specific symptom-command match for open reliability monitor, not as a generic dump of terminal lines. That makes the page more useful for real troubleshooting and reduces the chance of running the wrong repair step.
perfmon /rel
Best place to run it
Command Prompt is the right execution context for this page. Even when elevation is not always required, using the right shell prevents syntax mistakes and makes the output easier to trust.
Fast repair workflow
- Start from the exact symptom on this page: The PC feels unstable but the cause is unclear
- Run the primary line exactly as shown: perfmon /rel.
- This workflow is tuned for this repair, so avoid mixing it with unrelated repair commands too early.
- Test the original trigger again and compare the result with the problem description on this page.
- Move to the next repair family only after reading the output and deciding what actually changed.
Copyable wrapper script
Use this wrapper when you want the page command inside a clearer script block with start and finish prompts.
@echo off
echo Run this CMD sequence in the matching terminal window.
echo Starting targeted repair sequence...
perfmon /rel
echo.
echo Review the output before closing this window.
pause
Verification commands after the repair
These follow-up commands help you check whether the repair actually changed the Windows state that matters, instead of assuming success from a single line.
systeminfo
whoami /groups
What problem this command is trying to solve
This command opens a diagnostic view for crash and stability history.
- The PC feels unstable but the cause is unclear.
- Apps or updates fail repeatedly.
- You want a quick crash timeline before changing the system.
How the command works
perfmon /rel opens Reliability Monitor, which displays stability history based on Windows error reporting.
When it makes sense to run it
Use it early in troubleshooting when symptoms are real but the cause is still vague.
Before you run this command
- Open the shell that matches perfmon /rel before you paste it.
- Confirm that the symptom really matches this guide, especially if you are seeing signs such as: the pc feels unstable but the cause is unclear.
- Read the command once from start to finish so you know whether it scans, resets, or changes a stored setting.
What result to expect
After running perfmon /rel, compare the result against the symptom that brought you here. The most useful checkpoint is whether the pc feels unstable but the cause is unclear becomes less frequent, changes form, or produces a clearer error message. A command page is stronger when it helps you verify a real change instead of just assuming the line must have worked.
How to verify that it worked
The best verification step after perfmon /rel is to repeat the action that previously triggered the problem. If apps or updates fail repeatedly still appears in exactly the same way, the command probably was not the whole answer and you should move to the next targeted check instead of assuming the page is finished.
Shell and execution context
This command usually does not need a full elevated repair context, but it still works best when you run it in the shell it was written for and read the output carefully.
Before you run it
Reliability Monitor is diagnostic only.
When this is probably the wrong fix
This is not the right first fix for every random Windows problem. Use it when the symptom and command target on this page clearly line up with what your PC is actually doing.
What to do if it does not help
If perfmon /rel does not improve the pc feels unstable but the cause is unclear, move to the next repair step that matches the same symptom family instead of piling on random commands. The best follow-up depends on whether the failure is mainly about the specific Windows behavior described on this page.
Frequently asked questions
Should I use perfmon /rel for this exact Windows symptom?
Use it when the behavior on your PC lines up with the repair target on this page: This command opens a diagnostic view for crash and stability history.
What should I check right after perfmon /rel?
Check whether the original trigger still reproduces the same failure. For this page, a useful checkpoint is whether the pc feels unstable but the cause is unclear becomes less frequent, changes form, or points you toward a more specific next step.
When should I not rely on perfmon /rel alone?
This is not the right first fix for every random Windows problem. Use it when the symptom and command target on this page clearly line up with what your PC is actually doing.