How to install Windows Xp Embedded 2009 in Thin Client t5740?

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There are more than 4 thin clients computers in my office,which is having a pre-installed Operating System (windows xp embedded 2009)but few days back one of the thin client Os gone currupted and it fails to boot, the problem is that it contains an Os which is different and I am finding it difficult to format and install the operating system, so please help me find the solution to install it successfully........