Strange problem with IE7 on a wireless Gateway notebook running Vista...

My network setup is:
-4200 Speedstream ADSL Modem (windstream.net)
(into a)
-Linksys WRT54G
(with the following attached)
-[Wired] Desktop running XP {No signs of problems}
-[Wireless] Notebook Running Vista Home Premium {problems}


My Problem is:

In IE7 on my wireless Vista notebook I'm having a huge delay (only with some
websties) in what seems to be a response back from the server of some of the
websites I'm trying to go to. Most pages load quick like normal, but some
sites hang right after you click it, and it sits there saying "Connecting..."
then after a few minutes the page eventually loads (never timing out). this
problem is very consistant, the sites that load normally always load normally
and those that load slow always load slow, painfully slow.

There seems to be no page-weight issue because several "heavy" pages load
just fine most of the time. It really seems like some kind of scripting
problem and not a DSL speed issue because my desktop doesn't have this delay
problem. I have tried just about everything to resolve this problem but I
just can't get it. Please Help

Example Sites:
http://www.msn.com (Loads very Fast)
http://www.lexmark.com (Loads Very, Very Slow, at lease 3 minutes or more)

Even http://192.168.1.1 the router pages load extremely slow (3+ minutes per
page) and they are local files... what is going on here?

I'm using Macafee virus suite and have tested most of the setting in it and
Internet Explorer 7 and have had no change in results. Is it some kind of
firewall setting somewhere? I've tried shutting everything off with no effect.

I do not have this problem on The (wired)XP machine w/ IE7


Regards,

Billy Radd