There is the possibility that the XML files that store a list of the tags can get corrupted and the Windows Live Writer isn’t starting anymore.

Joe Cheng form the developer team of the Windows Live Writer published a workaround if this problem is showing up.

Delete all files under

Vista: %AppData%\Windows Live Writer\Keywords\

XP:%UserProfile%\Application Data\Windows Live Writer\Keywords\

source: Live Writer does not load on start-up : Windows Live Writer (General) : Windows Live : Microsoft Forums

thx Scøtt

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