Very Strange Connection Problem

I'm running a d-link DI-524 wireless router i've got 2 laptops, & 2 pc's connected wirelessly, and 1 comp hardwired. they have been running fine, with a few hiccups when originally adding the other wireless pc. but all works fine now.... untill this avo, i get home and the missus can't access the internet, nor connect to the network. it still detects the network tho, and appears to have full strength, i also have my pc next to her's also wireless. mine has no problems whatsoever. the network adapter running is a d-link DWL-G510 i've tried everything i can think of nothing seams to be working.

any suggestions would be greatly appraciated

thanks