Internet Explorer - Vista, having issues

[The Cisco Kid]

Greetings folks!

So about a year ago I put together a shuttle for my girlfriend. For some reason over the last four days she's been having a lot of trouble viewing WebPages and downloading any type of file. She can't even view emails on Yahoo or access weather.com. She can however view sites like CNN. We've also had a terrible time uploading photos to various sites using her desktop. It just seems very strange. Her computer is connected to the internet via a D-Link wireless card (she's got about 2-3 bars on average w/ good signal strength). We're using a D-Link gaming router.

Even stranger is that my desktop is connected directly to the router via an Ethernet cord and I have no problems at all.

I've yet to check for the latest drivers, but was curious if any one has ever had something like this happen before? Does this sound like just a wireless card issue? Router?

Thanks for the help!