1. Have you made any changes to your computer prior to this issue?
2. Is this an issue adding a particular address or with all the addresses?
Follow the suggestions and check if it helps.
Method 1 You may run System file Checker tool.
How to use the System File Checker tool to troubleshoot missing or corrupted system files on Windows Vista or on Windows 7 http://support.microsoft.com/kb/929833
Method 2 You may follow the steps :
a) Click start. b) In the search box type services.msc c) Right click Credential manager and Go to Properties. d) Select Manual from the Startup type drop down menu.
e) Click Apply and OK. f) Restart your computer.
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