Vista, wireless and DSL-G624M

Hi, I've had wireless working fine under XP, with WPA. Having installed
Vista now my wireless will not work unless I disable the WPA security, it
also doesn't work with WEP. I've doubled checked my security key several
times and I am certain it is correct, I have also used several different
versions of the wireless card's drivers either from Realtek or from Asus. I
have been in touch with D-Link and they've suggested that wireless security
may not be properly enabled within Vista.
Has anyone had experience with this or am I alone?
Many thanks
ChrisC

Hardware:
Asus P5W DH Deluxe
Realtek RTL8187 Wireless 802.11g 54Mbs USB 2.0 Network Adaptor(came with the
motherboard)
D-Link DSL-G624M