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    Safely reclaim space from C:\Windows\Installer with a diagnosis-first workflow

    The hidden C:\Windows\Installer folder is a quiet system cache that can quietly swell into tens of gigabytes on long-lived or heavily patched Windows PCs — and cleaning it safely requires methodical diagnosis, a recovery-first workflow, and an awareness of what Windows needs to repair, update...
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    • disk space management system cleanup windows installer windows maintenance
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    • Forum: Windows News
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    August 2025 Windows Installer Hardening Triggers UAC Prompts and Repair Failures

    Microsoft has confirmed that an August 2025 security update intended to close a Windows Installer privilege‑escalation hole instead changed MSI repair behavior in ways that produced unexpected User Account Control (UAC) prompts and silent repair failures for many non‑administrator users across a...
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    • enterprise it security update uac prompts windows installer
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    • Forum: Windows News
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    TOCTOU in Windows Installer CVE-2026-20816: Local Privilege Escalation Risk

    A time‑of‑check/time‑of‑use (TOCTOU) race condition in the Windows Installer service has been cataloged as CVE‑2026‑20816 and is being treated as a high‑priority local elevation‑of‑privilege (EoP) vulnerability that can allow an authorized local account to escalate to administrative or SYSTEM...
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    • privilege escalation security update toctou race condition windows installer
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    • Forum: Security Alerts
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