F9K1002v1 / Connected To Wireless Network For Short While But Cannot Access Internet

There is a problem with establishing an internet connection between my laptop and any wireless network, and hence the internet cannot be accessed. Though, the connection can be established locally between my laptop and the wireless network for a short while before the connection is lost locally. There is certainly no problem with my current wireless router as there are internet connections between the wireless network and other devices. Prior to using the current wireless router, I used Linksys WRT54G for internet connection until recently when there was no connection between all devices and the Linksys wireless router, so I changed my wireless router to the current one. However, the problem still persists for my laptop. I can only get access to internet when my laptop is connected to the router using ethernet cable, as well as when my laptop is connected to the main cable modem using the same cable.My laptop model is Fujitsu Lifebook S Series and my laptop is running on Windows Vista Service Pack 2 and my current wireless router is Belkin N300 Wireless N Router Model F9K1002v1.What I have done so far are that I have ensured that the DNS client and DHCP client service are enabled and that I have used the method of "/release, /dnsflush and /renew" on the command prompt.Below is the /ipconfig /all description when this laptop is connected to the cable modem using ethernet cable:

Windows IP Configuration
Host Name . . . . . . . . . . . . : FujitsuUser-PC
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Broadcast
IP Routing Enabled. . . . . . . . : No

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