| The Internet Archive is currently running at reduced capacity due to a denial of service attack and security incident. You may experience slower download speeds than usual. |
Microsoft Download Center Archive
 | Security Update for Windows Vista for x64-based Systems (KB939778) |
A security issue has been identified in Subsystem for UNIX-based Applications that could allow an attacker to compromise your Windows-based system and gain control over it.
- A security issue has been identified in Subsystem for UNIX-based Applications that could allow an attacker to compromise your Windows-based system and gain control over it. You can help protect your computer by installing this update from Microsoft. After you install this item, you may have to restart your computer.
This update is provided to you and licensed under the Windows Vista License Terms.
| Knowledge Base Articles: | |
|---|---|
| Security Bulletins: |
Files
 | Status: DeletedThis download is no longer available on microsoft.com. The downloads below are archives provided by the Internet Archive Wayback Machine from the Microsoft Download Center prior to August 2020. |
| File | Size |
|---|---|
 Windows6.0-KB939778-x64.msuSHA1: 4c93c8195cebf537e4a9466fe689ef474c6b93c5 | 674 KB |
System Requirements
Operating Systems: Windows Vista Enterprise 64-bit edition, Windows Vista Ultimate 64-bit edition
Installation Instructions
- To start the download, click the Download button and then do one of the following, or select another language from Change Language and then click Change.
- Click Run to start the installation immediately.
- Click Save to copy the download to your computer for installation at a later time.