Your router does support linksys, trust me, hell- the router probably runs some form of BSD. Linksys mean their support line is costly enough at highly deflated outsourced prices that they don't want to confuse matters, with outsourcing you get what you pay for, and moving your operation to India to get away with paying workers a pittance... But rant over.
You really need to give a lot more information than that. What distro are you using? (Though judging by 'ASUS 7" Screen' I'm guessing you have an eeepc, so it'll be Xandros).
The eeepc has always had trouble connecting wirelessly with WPA/WPA2, the eee forums, or even the eee wiki, are probably your best bet here, or you can do what I did, replace Xandros (Which is a mess, frankly) with something like Ubuntu- Mine runs Debian and frankly has never run better. The wireless card worked right out the box.