The warning applies ONLY to BitDefender Antivirus 2010. I installed BitDefender Antivirus 2010 on my home desktop (WinXP Pro SP3). The installation and post-install reboot went OK. Upon returning to the desktop the BitDefender Antivirus 2010 Configuration automatically started. I configured and then downloaded updates. The update required a reboot. On reboot, just after all the Windows shutdown dialogs disappear, I got the BSoD (Blue Screen of Death). This happened for ALL reboots/shutowns after this. Contacted BitDefender Support, did several removal/reinstalls, and NOTHING fixed the problem. Fully removed BitDefender Antivirus 2010. Installed BitDefender Antivirus 2009 (which I already had but did not install at the time) and the install, configuration + updates, reboots, were done with out a hitch. BitDefender Antivirus 2009 did NOT cause the BSoD. This is a problem specific to my systems's hardware, because I know of several other people who run BitDefender Antivirus 2010 without a problem. Just be warned about the 2010 version. Bottome line, BitDefender AV 2009 works on my system, BitDefender AV 2010 does NOT work on my system. EVALUATION: BitDefender Antivirus 2009 OUTSTANDING The reason for going to BitDefender was because the last update of McAfee AV (which I was running) bogged-down my system. With BitDefender AV 2009 my system purrs-like-a-kitten. Also the automatic Gaming Mode made all my games run better.