How to Reset Windows Reliability Index with Regedit

The Windows Reliability Monitor tracks system stability and logs application crashes, Windows errors, and warnings to generate a stability index score ranging from 1 to 10. Over time, resolved issues can leave lingering low scores that no longer reflect your system’s current performance. This guide provides a direct walkthrough on how to clear this history and reset your Windows reliability index metrics using the Windows Registry Editor (regedit).

Step 1: Open the Registry Editor

  1. Press Windows Key + R to open the Run dialog box.
  2. Type regedit and press Enter.
  3. Click Yes when prompted by User Account Control (UAC).

Step 2: Navigate to the RAC Registry Key

In the Registry Editor address bar at the top, paste the following path and press Enter:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Reliability Analysis\RAC

Step 3: Clear the Reliability Metrics Data

  1. In the left navigation pane, locate the RAC folder.
  2. Right-click the RAC folder and select Export to create a backup file on your desktop before making changes.
  3. Once backed up, right-click the RAC key and click Delete, or expand it and remove all subkeys and data values contained inside the folder.
  4. Right-click the parent Reliability Analysis folder, select New > Key, and name it RAC to recreate a clean root key.

Step 4: Clear Cached RAC Data Files

To ensure the registry does not reload historical data from the local cache:

  1. Press Windows Key + R, type C:\ProgramData\Microsoft\RAC, and press Enter.
  2. Open the PublishedData folder and delete all files inside.
  3. Open the StateData folder and delete all files inside.

Step 5: Restart the System

Restart your computer. Once rebooted, Windows will automatically regenerate fresh registry entries under the RAC key and reset your Reliability Monitor index to a clean state. New stability metrics will begin calculating within 24 hours.