you sure it's connecting to your wifi and not your friends?
Reset it.
and lose all my data, i think not
Your router shouldn't lose data when you reset, what the forget are you smoking?
Try manually connecting it to the router.
Might be something up with the MAC address
You've had your PS3 for years? Have they even been out for years?
The PlayStation 3 was first released on November 11, 2006 in Japan,[12] November 17, 2006 in North America,[13] March 16, 2007 in the United Kingdom and Ireland, and March 23, 2007 in mainland Europe and Oceania.