Hi, You say you can see the router from the LT, so have you configured the laptop?
Initially most manufacturers say to initially use a crossover cable to set up configuration of router once this is done remove cross over cable and you should be OK.
when you move the mouse so that the pointer is on the wireless icon in your system tray down by your clock does it give informatioon such as connection speed and quality? On my computer the wireless icon looks like a TV with two brackets to the right, the box of the TV should also be flashing.
I know this may sound stupid but have you made sure your wireless connection is switched on? It varies from machine to machine, on my Toshiba there is a switch on the front of the LT while on my Wifes LT she has a function button to press which has a wireless aerial symbol. Your LT definitley is wireless capable as some models need adapters fitted.