BleepingComputer.com: Internet very slow on new vista computer

Hello,

I recently purchased a Gateway 4300-05 (vista 64 bit). It worked well for about 2 days, and now the internet is very very slow, both browsing and downloading. I also have a laptop running xp that is on the same network and is still blazingly fast. I am unsure as to what information you may need, but I am not really doing anything special. My antivirus program is Avira. Thanks in advance for any help you can provide!