Unfortunately subscription to One Care is not supported in Turkey. The Windows Live OneCare subscription service is available in the following countries and languages: Australia (English), Austria (German), Belgium (Dutch, French), Brazil (Portuguese), Canada (English, French), France (French), Germany (German), Hong Kong (English), Ireland (English), India (English), Italy (Italian), Japan (Japanese), Mexico (Spanish), Netherlands (Dutch), New Zealand (English), Singapore (English), Spain (Spanish), Switzerland (French, German), United Kingdom (English), United States (English, Spanish).
Additionally purchase of One Care will be discontinued shortly. See this announcement -
http://social.microsoft.com/Forums/en-US/onecareinstallandactivate/thread/ebe7e8de-c7a2-41c7-9072-24d3a2bc04ec
Jim - MVP Windows Live - Forum Moderator - Live One Care - Live Mesh