My desktop is running XP Pro SP3 and has McAfee A/V protection installed:
[Security Center 9.15, Virus Scan 13.15, Personal Firewall 10.15. Anti Spamware 10.15]
CPU Intel x86 PC with 4Gb main memory running on 945HCM-S mother board
BIOS American Megatrends P1.00 08/19/2008
Data Execution Prevention is active [essential Windows & services only].
Browser: IEP vrsn 8.0.6001.
Windows update facility reported that no high priority fixes were needed.
(However Belarc Advisor 8.1b shows that 3 critical & 13 important updates are missing!)
Malwarebytes Anti-Malware detected & removed "Security Shield" rogue Trojan introduced inadvertently by daughter (non administrator access rights) via email message.
How can I ensure that infection cannot recur (for any Trojan)?