Fix for Error 100 Invalid Class String in Internet Explorer When Opening Organize Favorites

When you click the Organize Favorites option under the Favorites menu in Internet Explorer, the following error occurs and the Organize Favorites dialog appears blank as in the graphic below:

An error has occurred in this dialog.

Error:100

Invalid class string

This happens due to missing Microsoft JScript registration. And the fix is to register the DLL.

Windows XP

1. Login to an account that has administrative privileges.

2. Click Start, Run. Type the following command:

regsvr32 jscript.dll

3. Press {ENTER}

Windows Vista and Windows 7

1. Open an elevated Command Prompt window. To do so, click Start, click All Programs, click Accessories, right-click Command Prompt, and then click Run as administrator.

2. Type the following command:

regsvr32 jscript.dll

3. Press {ENTER}

You should see the "DllRegisterServer in jscript.dll succeeded." message box.

Logoff and login back. See if you’re able to open the "Organize Favorites" dialog in Internet Explorer successfully.

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One Comment

marytea13

said this on Monday, June 21st 2010 8:39 am

Thanks this answer fixed the problem for me.