As promised, today we will be talking about how to fix error 8100030d when trying to sign in to Windows Live Messenger. The solution is to empty your Contacts cache. The single steps depend on your Windows version.

If you are using Windows XP, try the following.

• Are you using the latest version of Messenger? If not, consider updating at http://download.live.com/messenger.
• Exit Messenger.
• Show hidden folders in Windows Explorer.

• Click Start, My Computer.
• Open the Tools menu, and choose Folder options…
• Switch to the View tab.
• Check the option Show all files and folders.
• Uncheck the option Hide file extensions for known file types.
• Click OK to close the dialog.

• Browse to C:\Documents and Settings\\Contacts\.
• Delete all files in this folder. Do NOT delete the folder itself, only its contents.
• Now browse to C:\Documents and Settings\\Local Settings\Application Data\Microsoft\Windows Live Contacts\.
• Delete the two subfolders Real and Shadow inside this folder.

In case your operating system is Windows Vista or Windows 7, the following steps should help.

• Are you using the latest version of Messenger? If not, consider updating at http://download.live.com/messenger.
• Exit Messenger.
• Show hidden files in Windows Explorer.

• Click Start, Computer.
• Open the Organize dropdown, and choose Folder and Search options…
• Switch to the View tab.
• Check the option Show all files and folders.
• Uncheck the option Hide file extensions for known file types.
• Click OK to close the dialog.

• Browse to C:\Users\\Contacts\.
• Delete all files in this folder. Do NOT delete the folder itself, only its contents.
• Now browse to C:\Users\\AppData\Local\Microsoft\Windows Live Contacts\.
• Delete the two subfolders Real and Shadow inside this folder.

Note: The is your Windows user name; the is the e-mail address you use to sign in to Messenger.

This fixed your issue? Wonderful.
It didn’t? Please contact the Windows Live support at http://support.live.com/ .

Source:
http://messengermaximal.spaces.live.com/Blog/cns!40F43EC9BA81D814!5903.entry
http://messenger-support.spaces.live.com/blog/cns!8B3F39C76A8B853F!13937.entry

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