I am using NAV 05 v18.104.22.168, latest update with winXP SP2 Now while searching the TC++ installation folder NAV hangs & XP throes up the usual system crash warning saying that the NAV has uncounted a problem & has shut down. NAV it self also gives an error massage saying that the NAV hasnâ€™t been installed properly. I have tried by reinstalling & repairing it but the problem persists. After excluding the problem folder NAV has successfully scanned the full system. By the way NAV 05 has a new internet worm protection. At the time of installation NAV suggested to turn off the windows fire-wall which I didnâ€™t, is this going to cause any problem? & should I turn off windows fire-wall?? Another thing is NAV is not communicating properly with windows security center. As in the time of installation NAV 05, its virus definition release date was much let. I updated it after 2 days. Between that time security center reported that the NAV system status is alright & definition is up-to-date although NAV main window is displayed that it needs urgent attention & threw the auto update window. & auto protect doesnâ€™t seems to work properly. Like, NAV is detecting adware in a (*.zip) file. But amazingly itâ€™s allowing me to unzip the file. But AVG 7.0.290 which was installed earlier doesnâ€™t allowed me to unzip the file. In the end, after reading lots of news reviews about NAV 05 I expected it to consume less system resources than previous versions. But I was disappointed to see it takes almost same amount of resource & thus slows the system down. Any tips, comments or suggestion??