When I die, I am going to have this carved on my tombstone, in bold, italic and underlined:
"Don't ask - I didn't do anything - it just started working again!"
I opened up the D-Link setup protocols and didn't change a thing - I just looked. I took a copy of the WAP key to check the laptop settings. I then fired up the laptop, checked that I couldn't get into the troublesome PC and guess what - the link worked!
Aaaaaaaaarrrrrrrrggggggggghhhhhhhhhhh!!!!!!!!!!!!