Fix Taskbar Reset To Default Settings Problem When "Automatically Log On" Feature Is Enabled In Windows 7
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Windows 7 has a new handy feature in which you can set it to login to Windows automatically. But the feature can cause a problem of losing customization settings in taskbar. According to Microsoft, some users may see that the taskbar gets reset to default settings after auto logon to Windows.

The problem is seen in Windows 7 and Windows Server 2008 R2 edition. According to KBA979155 , this problem occurs because of a race condition between Windows Explorer and Taskhost.exe.
There is an Hotfix available to fix this issue. Note that you have to apply the update ONLY when you face this bug.