Disabling the 'use DNS prefetching' in the option menu's "under the hood" tab may help. This should solve the resolving issue.
If not, check your proxy settings. If your not using a proxy, click on "Lan Settings". Make sure "Automatically Detect Settings" is un-checked. Click "Ok".
Final check if still no luck:
Start > Settings > Control Panel. Load up the "Network Connections". You will now see a list of the network cards and bridges on your computer. Only one of these is used by your computer to connect to the internet. For example, if you are using wireless internet you will only be using the wireless connection. Right click on each other connection and select "disable". You should only have one enabled connection.
Important: Restart your machine after changing setting(s) to check.