Linksys WRT610N connection problem

[billy_boy786]

Hi, this has been giving me trouble for a good few days now, heres the story:

Ive had the router not too long, 2months or so.. been working fine till my brother introduced another laptop to the network..
currently i have it wired to my main pc, and using wireless on 3 laptops in the house (including the new 1)
however, 1 laptop is now not connecting to the wireless, whereas the the other 2 connect just fine. the lappy with the problem, sees the wireless router, but does not automatically connect as it is setup to do so.. manually trying to connect, only tells me it could not and asks to run the troubleshooting. when i run that it tells me to unplug the router for 10 seconds and try again, this doesnt seem to help. at first i thought it may have been a problem in the wireless card in my laptop but it connects just fine to my neighbours wireless.
it has me very confused.. i dont have firewalls in place, and am running win 7 on the lappy with issue..

Any help would b fab!

[enigmas]

Some more details could help, for example the router is only on N mode or it has the full band B/G/N or B/G, the WiFicard supports all the above bands or just b/g, what is the frequency of the emitting signal?