Well, I went ahead and tried Trend-Micro again on my HP Pavilion a1220n with XP home. Using the Norton Removal Tool to uninstall Norton AV 2005, it seems to be working this time. (You can see my other post in this category: "Want to demo Trend-Micro...again"). I have removed all traces of Symantec that I could find, including reg entries, and I even found a Symantec service that I disabled. However, the Windows Security Center did not change from "Windows has found Norton is up and running..." (not verbatim) to "Windows has found Trend-Micro...". Instead, it now says: "Windows has found MORE THAN ONE AV, and at least one is up and running..." (again, not verbatim). Should I be concerned about this, or should I just ignore it? By the way, my Zone Alarm is recognizing the Trend-Micro as being active and current. Again, the Trend-Micro seems to be working well. Any advice is appreciated. Thank you.