Yusuf Il :
does my computer with windows 10 stop working ?
if I installed programs and games on it will I be able to update to the final version without to lose my data ?
The current concept from Microsoft is that a current Preview will be able to be upgraded to the final release (sometime in the Fall) without a reinstallation. Of course, that may change.
For your Tech Preview - there is a Consumer Preview that you should upgrade to. Not sure why yours hasn't done it automatically yet.
However....MS has specifically NOT stated what will happen with a clean Windows 10 install, as far as 'buying it'.
Current Win 7 & 8.1 users will be able to upgrade to 10 for free. That is because you already bought an OS from them.
They have NOT said...