thank you every one.
Originally Posted by daffy4u
If you want to read a sample on your computer, you have to get it from somewhere else. Go to MobiPocket.com for books samples. DO NOT buy books from them for your Kindle because they have a different encryption that won't work on the Kindle. The samples are not encrypted so you can read them on your computer or your Kindle.
You will also need to download MobiPocket Reader
to read the samples on your computer.
this is very useful advise
it solve my problem
i wonder way amazon don't make it this simple !
thanks very much