In recent weeks, I have been unable to download from certain sites or to download certain files, such as Adobe Flash downloads, Norton updates and programs, and some images files. A "Web Acceleration Client Error (508.2) - DNS Response Error" screen is displayed. But this does not occur, I've recently discovered, with a 64bit laptop connected to the same router and satellite modem.
I use Hughesnet satellite with Windows 7, IE9, Norton Internet Security and Malwarebytes Anti-Malware, on a 32bit Dell PC, connected to a 2-PC home LAN using ethernet cables.
Any suggestions for how to determine why the laptop works and my two desktops do not?