Unable to make project in windows ce 5.0 in VS 2005

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C#

Hi All
Recently I opened a VS2005 Smart Device project that I was assured worked for others, only to face an error message box:
Microsoft Visual Studio
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Error retrieving information from user datastore. Platform not found.
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OK
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When I hit my only choice, which was the OK button, a warning message box appeared:
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Microsoft Visual Studio
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The project could not be opened because it refers to a device platform that does not exist in your datastore.
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OK Cancel
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Clicking OK or Cancel had the same effect: the project does not load (i.e. it is "unavailable" in solution explorer).

Please help me to come out from this problem

Thanks & Regards
Indrajit Dasguta