Just an update. Have run the Bugbear removal tool from NAV, it reported no infected files. have restarted puter several times, try to restore reg. files but with no success. But at least I can now access PCA Forum, so at least one bit of progress. Have managed to log onto my network this time, but will try rebooting again to check if it is permanent. Have not changed any network settings, just checked them again. Ho hum, I spose I shall to get on with some work before the boss returns!!