A malicious Win-XP Help Center request can easily and silently delete the contents of any directory on your Windows machine. Worse, MS has rolled the fix silently into SP1 without making a public announcement. A good sketch of the problem in English, along with a harmless self-test, can be found here, thanks to Mike at http://unity.skankhouse.org, who did some tinkering after noticing a tip on a BBS. Another, slightly earlier, mention comes from VSAntivirus, but the page, unfortunately, is en español, though there are some handy screen shots in their bulletin. more..