If all else fails, try deleting all the existing network connections.  Then delete/remove the wireless modem from the hardware.  Reboot the laptop.  It should find 'new hardware' and add it without a problem.  Then try to search for the wireless network and attempt to connect again.
WEP means wireless encryption privacy, WPA means wi-fi protected access, WPA2 is 2nd generation.  All are techniques to make it harder to intercept your wireless data.
Paul Hachmeyer
.
 > On Mon, May 16, 2011 at 2:12 PM, Katz <[log in to unmask]> wrote:
> > *I'm trying to get my Compaq laptop running Vista to work with my router.
> > I'm using Comcast Broadband with an Arris modem plugged into my 
> > Netgear router, which is plugged into my pc.
> >
> > The laptop finds the signal, but can't connect.  I have the Wireless 
> > Security set as WPA_WPA2-PSK and have a password.
> >
> > Thanks.
> >
> > Diane

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