I recently downloaded a freeware prog called SpywareBlaster, that I use in conjunction with SpyBot Search & Rescue (also freeware). Used together, they 'immunize' your system against bad Active X controls...supposedly, and of course, Spyware. I also have Ad-Aware6 (not freeware) to cover what the others may miss. All I can say is that I try to run these progs at least twice a week. So far they have not failed me, and I have not had any probs with any of them crashing my system (OS = XP Pro), if you wish to try them out. Actually, my system has NEVER crashed, but I've only had it less than a year so far. In addition, I also use Norton System Works Utilities to keep the registry clean and in order.
I'm very big on security programs and utilities, and am looking into the Anonymizer Privacy Manager at the mo.
Other useful utilities I've found and use are East-Technologies 'Eraser Pro' file shredder (for those of you that don't know, when you delete a file, it doeasn't REALLY get deleted by Windows...hence Eraser Pro, which erases a file beyond recovery), and Executive Softwares 'Diskeeper 8.0', which is a great disc defragger, that works better and faster than the Windows built in utility. They have versions that are OS specific, from W98, all the way up to Enterprise and Server editions (for example, the Home version will not work on XP Pro, but the Pro version will work on XP Home. Why?...I don't know, unless it has something to do with the NTFS that NT, W2K, and XP Pro work on; but I have both versions now anyway, because they sent me the wrong disc initially, and didn't ask me to send the Home version back), so if you download it, be sure that the version you are getting is the right one for YOUR Operating System.
All of the progs that I mentioned that are not freeware do have trial versions available if you wish to try them out for yourselves.
I'm no tech wizard either, but I hope some of the above helps ALL of you.