| Internet Explorer 4.0 Setup Updates 128-Bit EncryptionLast reviewed: November 26, 1997Article ID: Q174494 | 
| The information in this article applies to: 
 
 SUMMARYWhen you install the English-language exportable 128-bit Server Gated Cryptography (SGC) add-on for Internet Explorer 3.02 on a computer with Internet Explorer 4.0 installed, you may receive the following message: 
 Microsoft Internet Explorer SGC 128 update Your computer already has a newer or 128-bit version of this product. Installation will exit. MORE INFORMATIONWhen you install Internet Explorer 4.0 over the 40-bit non-SGC version of Internet Explorer 3.02, the Schannel.dll file is updated to the new SGC version. When you install Internet Explorer 4.0 over the 128-bit SGC version of Internet Explorer 3.02, the Schannel.dll file is updated to the new 128-bit SGC version. When you install Internet Explorer 4.0 over the 128-bit strong encryption version of Internet Explorer 3.02, the Schannel.dll file is updated. To enable 128-bit strong encryption in Internet Explorer 4.0, use either of the following methods: 
 
 ARTICLE-ID : Q148427 TITLE : Server Gated Cryptography (SGC) Update for IIS ARTICLE-ID : Q135982 TITLE : How to Configure Internet Explorer to Use a Proxy Server ARTICLE-ID : Q155444 TITLE : Description of Digital Code Signing in Internet Explorer ARTICLE-ID : Q174360 TITLE : How to Use Security Zones in Internet Explorer 4.0 | 
| Additional query words: 4.00 
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