Random IE7 "cannot display webpage" errors

I have recently purchased a new computer that is running Vista on it and from the start only I have got some problems with Internet Explorer 7 and Windows Live Messenger. I usually connect to the internet with a wireless network connection using a Linksys Wireless-G USB Network Adapter with Speedbooster, and I didnt have this issue with the XP computer that I had, which was also having IE7 and Windows Live Messenger. So, it seems to me that it is either a Vista problem that has something to do with my Internet connection settings. Can anyone help me to sort this issue? Thanks

Did you try to reset the modem or the router? If resetting the modem or the router did not resolve the problem, try deleting your browsing history. Follow the steps for your version of Internet Explorer to delete your temporary Internet files, history, and form data. You can follow the steps given here - http://support.microsoft.com/kb/956196

You may try Microsoft Automated Troubleshooting Services as a first step to diagnose and repair common network connectivity problems in Internet Explorer. You should run both troubleshooters to determine if your problem is resolved.

Diagnose and fix Windows Firewall service problems automatically
Improve performance, safety and security in Internet Explorer