Hello shlomiio, One Care is not available worldwide at this time. From the One Care FAQs:
In which countries and languages is Windows Live OneCare available?
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).
More countries and languages will be added over time. The decision on which countries and languages to add are based entirely on market potential, the ability to build infrastructure such as customer service and support, international law and local regulations. I find your speculation as to why you are not able to install One Care quite offensive.
