I have a problem with the Internet connection thru WiFi.
Some time ago I had reinstalled OS (XP Sp3) on a notebook (Samsung R560 with a WLAN adapter that's specified as 'Intel 802.11a/b/g/n 1x2 (MIMO) / Intel 802.11a/b/g/n 3x3 (MIMO) / Atheros 802.11b/g'). Then (I understand that 'then' doesn't mean 'therefore') I faced the following problem: I could access to local network, but not to the Internet.
ISP's broadband Internet cable is connected to WiFi router ASUS WL-500, having local IP address 192.168.1.1 (DHCP is disabled). Both 2 and 3 are assigned to a Windows server and another notebook. 192.168.1.4 is assigned to the Samsung notebook. I had installed a custom Intel utility on top of the WLAN driver, then (after the problems begin) uninstalled it, so now I have the naked driver.
From time to time, the Internet connection gets broken: no external sites are available, Skype is out, Outlook can't get e-mails. Nevertheless, I still have access to the local network, say, \192.168.1.2\c$. The other machines are still connected to the Internet thru the same router.
What can be the problem root? What have I look at?