SIDCHG Windows Computer SID Change — Procedure, Risks, and Interrupted Operation Recovery

Indicators

• Login screen displays SID change progress message with a progress number — indicates SID change is running or was interrupted in background
• SID change progress message remains at login screen after reboot — SID change was interrupted before completing
• Desktop icons flickering after SID change — caused by UCPD driver running during a previous SID change
• Windows File Explorer becomes very slow after SID change — typically caused by stale mapped network drives
• Search box freezes after SID change — caused by Modern Apps integrating with Search not reset before SID change
• Modern Apps fail to work correctly after SID change — app data still bound to previous SID
• Message 'Reboot computer to complete stop of UCPD Driver before running SID Change'
• Message 'System Update Operations (...) are found to be performed at next reboot'
• Dump file SIDCHGxxx.dmp present in C:\Windows\Temp — SIDCHG crashed during operation

Likely causes

• Antivirus real-time protection terminated the background SIDCHG process mid-operation, leaving system with partial SID change
• User logged in or manually shut down the computer while SID change was running in background on Windows 10/11/8.x
• UCPD driver was running during SID change, blocking registry SID changes and causing desktop icon flickering
• BitLocker volume encryption was enabled during SID change, risking complete data loss
• Pending Windows system update operations conflicted with SID change
• SIDCHG run from user download directory caused antivirus to flag the self-copy to C:\Windows\Temp as suspicious
• Domain computers lost domain membership after SID change; domain controller SID cannot be changed without demotion first

Diagnostic steps

1. Determine the current local computer SID using PowerShell: Get-WmiObject win32_useraccount | Select name,sid
   Establish baseline SID before change; Administrator account SID minus the -500 RID suffix equals the local computer SID
2. Check UCPD driver status: SC QUERY UCPD
   UCPD driver must show STATE: 1 STOPPED before SID change or registry blocks will cause incomplete changes and desktop icon flickering
3. If UCPD is running, disable it: SC CONFIG UCPD start=disabled — then reboot
   Stops UCPD driver so it will not block registry SID changes during the operation
4. Check C:\Windows\Temp for SIDCHGxxx.dmp files: dir C:\Windows\Temp\SIDCHG*.dmp
   Presence of dump file indicates SIDCHG crashed; send to support@stratesave.com for analysis
5. If SID change appears stuck at login screen, check if progress number in the message is changing — press OK then click login screen to refresh
   Distinguishes between a hung process and one still actively working; wait at least 15 minutes before concluding it is stuck
6. For an interrupted SID change: boot into Troubleshoot mode Command Prompt WITHOUT logging into Windows
   Avoid further corruption by not loading the partially-modified user profiles
7. Locate Windows drive (usually D: in WinRE) and run: SIDCHG64 /OS=D:\Windows
   SIDCHG detects the interrupted state and proposes to complete the change with the same options as the original attempt
8. List installed Modern Apps for targeted reset: Get-AppxPackage
   Identify which PackageFamilyName values to reset with /RESETAPPS= if experiencing Search box freeze or app failures

Resolution path

• Pre-SID-change preparation: Disable BitLocker completely, disable antivirus real-time protection (or add process exclusion for C:\Windows\Temp\SIDCHG64_.exe), stop UCPD driver (SC CONFIG UCPD start=disabled then reboot), ensure no pending Windows updates
• Back up Windows Vault credentials to %TEMP%\SIDCHG.crd with password SIDCHG; save EFS certificate with rekeywiz if encrypted files exist
• Store license key in registry on base image before cloning: SIDCHG64 /SK /KEY=<licensekey>
• Run standard SID change with computer rename and app reset: SIDCHG64 /COMPNAME=<newname> /F /R /OD /RESETALLAPPS — do NOT interact with the PC after this command; wait for automatic shutdown/reboot
• For MAC-address-based naming using a map file: SIDCHG /COMPNAME=* /CNMF=map.txt (format: macaddress=compname per line)
• For SID-only change without renaming: SIDCHG64 /F /R
• For computer name change only without SID change: SIDCHG64 /NS /COMPNAME=<newname>
• After completing SID change, optionally remove the license key from registry: SIDCHG64 /RMKNOW
• If domain membership is lost after SID change, rejoin the domain through System Properties
• Reset Windows licensing on cloned systems: slmgr -rearm

Prevention

• Always disable antivirus real-time protection before running SIDCHG, or configure process exclusion for C:\Windows\Temp\SIDCHG64_.exe
• Never run SIDCHG with BitLocker enabled — fully decrypt all drives first; re-enable only after SID change completes
• Run SIDCHG from C:\Windows, C:\Program Files, or C:\Program Files (x86) and unblock the downloaded EXE via file Properties to reduce antivirus friction
• Ensure no pending Windows Updates before SID change — reboot and let updates complete (may take 2 restarts)
• Store the license key in the base image registry using SIDCHG64 /SK before cloning
• Back up Windows Vault credentials and EFS certificates before any SID change
• Do not log into the computer or manually shut down while SID change is running in background — wait for automatic shutdown/reboot
• Ensure UCPD driver is fully stopped (SC QUERY UCPD shows STATE: 1 STOPPED) before running SID change
• For cloned systems: perform SID change before connecting to network, OR apply all Windows Updates first — avoid both simultaneously

Tools

• SIDCHG64.EXE — 64-bit Windows SID change utility (x64/x86)
• SIDCHG64A.EXE — ARM64 Windows SID change utility
• SIDCHGL64.EXE — alternative that skips browser SID changes; lower antivirus conflict risk
• PsGetSid (Sysinternals) — displays local computer SID from command prompt
• slmgr -rearm — resets Windows licensing information on cloned systems
• rekeywiz — saves EFS certificate for encrypted file preservation across SID change
• Credential Manager — backup/restore Windows Vault credentials
• NET USE — lists and deletes mapped network drives
• SC CONFIG / SC QUERY — controls UCPD driver startup type and state

References

• SIDCHG SID Change Utility — Official Product Page
• PsGetSid — Sysinternals
• Stratesave SIDCHG Download Page