I have an older Dlink wireless router (WBR1310) which runs perfectly with my XP OS laptop, using WEP to access the network. However I just purchased a new Sony Vaio which has vista as its OS. When trying to connect to the network with this laptop, it recognizes the network but is unable to connect for "an unknown reason", even after entering the passkey. I can connect to the internet by plugging in directly to the laptop via ethernet port but not wireless. My neighbor suggested that my wireless network card may not be compatible with my older wireless router. Any advice on how I can get my new vista laptop to connect? Thanks.

from Dlink:

If the adapter of a different manufacture, then configure the wireless settings on the adapter to connect to the gateway. The adapter needs to be configured for Infrastructure Mode using default for the SSID, no security. Eliminate distance as a possible factor by moving into the same room as the gateway. After you gain wireless connectivity, you can customize your wireless settings (SSID, security, channel, etc).

Also from Dlink

Make sure the following wireless settings are the same on the AP and wireless adapter:
* SSID (SSIDs are case sensitive)
* WEP settings (make sure the encryption levels and keys match)
* Network Mode is the same (Infrastructure or Ad Hoc)

If you still cannot get a wireless connection try disabling all security settings(WEP, IP address blocking, MAC address filtering, and enable the Broadcast SSID). Change the SSID to ANY on all devices. If you still cannot get a wireless connection try moving the units closer together.

hope that helps.