I uninstalled NOD32 v2.7 to try Vipre. I didn't notice any real performance improvement, so I reinstalled NOD32. Now NOD32 won't update. The virus signature database is 2257 (20070511). Windows Security Center is screaming. NOD32 says I'm up-to-date every time I do it manually. I tried uninstalling and reinstalling it again, but no joy. All reasonable suggestions entertained. Thanks.