There are tons of reasons. Most common are secured wireless is enabled, MAC table is enabled, your wireless adapter is not compatible with your wireless router, wireless router does not work properly and so on.
Wirelessly, use bluetooth or something similar
Connect zyxel prestige 660ru adsl wired router to internet then netgear dg834g, and then your PC and laptop to the negear router.
There is no internet piece to put on the PlayStation 3. Out of the box the PS3 can connect to the internet both wired and wirelessly. To use the wireless you must have a wireless internet connection though.
Most commonly in houses there is a wired connection from the ISP to the wireless access point. The computers in the house are wirelessly connected to the wireless access point. Having said that, access points that make use of 3G cellphone networks or WiMax do connect wirelessly to the internet. But that is not common yet.
A person is limited as to how fast their Internet can go when it is connected wirelessly. A person should connect to their modem with an ethernet cable whenever possible.
You need to check settings for the network adapter, also you need to make sure that the firewall allows connections.
The simplest solution would be to buy a longer cable.
Try BRIDGING the wired and wireless network adapters on the laptop: For Windows see http://www.microsoft.com/windowsxp/using/networking/expert/crawford_02april22.mspx
PS3 has the ability to have a wireless connection or a wired connection to the internet. It does not have wireless internet, you must purchase a broadband internet service. Many people already have broadband internet service for a PC and need a router to allow them to connect the PS3. A router will allow two or more items to be connected to the internet service. A wireless router will allow them to connect wirelessly if they both have a wireless connection capability like the PS3 and also allow them to be connected with an ethernet cable for a wired connection.
You need to add a wireless access point to your wired internet.
You go to internet settings, connect to network, and from there you have a option to connect WIFI or though wired connection.
Wireless or Wired (ethernet cable).