Installed it on an XP system. It produced an error on the initial scan complaining of out of date signatures despite a full update only minutes earlier. Tried to update again, but was informed that everything was current and up to date. The problem corrected itself 24 hours later. after updating. Tried creating a boot CD; Process halted with an IMAPI 2.x error. Requires KB9232716 update. Previous version did not require this.