1. Make sure you have the latest firmware installed on the ADDL modem/router.. There are some older firmware versions that simply don't support Vista/Windows 7 well.
2. Since you don't mention whether the Vista machine is connected wirelessly or through ethernet, be sure to check all cabling and connections on the Vista and if connecting wirelessly, check the manufacturer's website to be sure you've got the most recent wireless adapter driver installed.
3. Check the Vista machine for malware using BOTH of the free spyware removal programs below:
SUPERAntispyware Removal Tool
4. If you've got Norton installed on the Vista machine, we have seen some issues with Norton and its firewall. Some actually require the program to be removed to fix the issue. Your choice.
Hope this helps.
I have 2 computers with ASDL broadband, one with XP and the other with Vista Home Premium. Over the past 2 weeks the machine with Vista, when browsing, frequently gives me "Unable to open page" or 'Oops this link appears to be broken'. Often, when I use Google, the link doesn't open but instead my search term appears in the tab at the top. Yet when I click on the network connection icon in the system tray, it shows that I have internet access.
It doesn't happen on the XP, which make me wonder if it's Vista? I'd appreciate any help and advice.