I have installed the latest version of NOD Antivirus on Vista Ultimate x64 SP1 with 2Gb and an Intel Quad Core Q6600. However browsing seems very slow whilst other internet activity seems fine. It can take several minutes just to show the Google home page. I have tried using the 'Disable antivirus and antispyware protection' option but that had no effect on my problem. Then I uninstalled v3.0.642 and installed v2.70.39 and everything is lightning fast. I can switch between v3 and v2 and the problem appears and dissappears respectively. Does anyone know what is going on? Thanks!