Sort of on the topic, kinda.
I'm a network security tech, kinda semi-usetabe, and still do some home/home office PC security.
The MS antispy is, IMO, good for XP & later.. I don't run it on my Windows 2000 network and don't miss it.
The 'security' features built into XP are awkward enough to deal with, that compatibility becomes more than relevant, it's crucial.
I use
Kaspersky's Anti-Virus, which has a vast 'extended' database of spyware/trojans, and optionally can be used to eliminate same. Works. Real well. Commercial, 40$ ? approx a year, worth the money and then some. I don't sell it or any other software, this is what i use on a 6 comp home net, with a 2+ year perfect record (and two teenagers!). Possible substitutes are 'Nod32' , first choice, bitdefender, 2nd choice.
AVG & Norton are inadequate, and nearly equally effective. Either will work, most of the time. That's not enough.
Spywareblaster is a gem. IE-Spyads is another. Both are pure passive prevention. Use em. Free and compatible and don't hurt anything if you don't need them.
Using an alterative browser (Firefox or Opera) will prevent much spyware from installing.
Use of a proper 'tweaker' program can block installs of general categories (ActiveX, javascript, some others) of exploits, at the cost of limiting certain functions (users choice whether the tradeoff is beneficial, net).
Adaware (free version) is likely the single most useful free security program, and Spybot Search & Destroy a fine adjunct. They both miss things, but often not the same ones, and do not conflict in any significant way.
MS anti-spy should be regarded as any beta program, and in fact if you read the disclaimer, they do NOT accept any responsibility .. not terribly reassuring in general, and not my idea of something to trust. Microsoft has made enough mistakes on 'updates' in the past to be cautious.
The single most important defense is 'Don't'.
Don't click that email attachment. Don't click that link from a chatroom. Don't surf porn. Don't go to online casinos. Don't download 'free' (ha!) games..
Just, .. Don't. Save tons of hairpulling.
Last, (or first, whichever).. No One should run a comp on the net without a firewall. Either a hardware (router) or software (Kerio old 2.15, Sygate, or dealers choice) ..
There are adequate free ones, and very Nice paid ones. Kerio is my default recommendation, Sygate I use myself, Zone Alarm is popular and sort of works OK but sometimes has nasty problems. I don't trust it, some folks do.
Security slows the computer. Not hugely if it's good, but noticeably even then. Checking everything incoming or outbound takes time. Background (antivirus/antispyware) scanners take up a bit of the CPU potential. Weekly scans, updating definitions, testing and installs and research.. (you weren't going to take my word for it, were you?)..
So. Making the load on the computer less is a great way to insure performance doesn't decrease unacceptably.
To that end, uninstall unwanted programs. (Don't uninstall any Microsoft products unless you know why, especially all those hotfixes and security packs).
But that game trial that's expired, those old toolbar things you don't use, anything you've decided is unwanted, .. get rid of. NOT 'just delete'.. but 'Uninstall' from either add/remove programs, or with the programs own uninstaller. Do NOT 'just delete' programs. (sometimes that works but when it doesn't it's annoying).
Spending much money isn't a requirement. It is possible with free programs to have nearly good security. Much care and good habits will allow moderate safety.
ONE good program, (the best Antivirus you can install) .. is worth spending money on. Check ratings. If they don't Put KAV and NOD32 in the top 5...
Check a different rating. That one lies.
