Update: over the last few days I've noticed extreme memory usage by Windows Update, over 1GB RAM used for extended periods. Also extremely high disk access while that's going on. This is apparently a known problem on Win7 x64:
"Violence is the last refuge of the incompetent." -- Isaac Asimov "Never let your sense of morals prevent you from doing what is right." -- Isaac Asimov
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Every app wants to be a database app when it grows up