If you have a genuine copy of windows XP then is Windows M$ Security Essentials available free. Effectively it can be considered as a free update to your existing operating system. * http://www.microsoft.com/security_essentials/ It may also be worth being pro-active, and considering * obtaining virus removal tools and malware information, prior to any problem arising, because by then web access may be difficult. Look thro some of the existing threads for ideas and listings [http://support.mozilla.com/en-US/questions/787521#answer-141462 e.g. thread] * the backup and restore options <br />If you maintain total recovery backups, with backups of your data, then if you do get a virus etc., instead of struggling to remove it, it may be relatively quick and effective to just reformat and restore. BTW I am not sure this subject is strictly on topic for deep discussion on the forum.