I use, and have used a lot of dif AV, and clearly Kaspersky will find stuff no other program does. It will go as deep as you want, depending how you set the preferences. NOD 32 is also as good, but too many false positives.
People having bad experiences are prob using conflicting AV or firewall - especially O/S firewall, or the non execute hardware based stuff. Obviously, a blue screen means you have to turn SOMETHING off to make KAV work
For example:
How to disable DEP
To disable DEP, perform the following actions:
Click Start -> Run
Enter: Notepad %SYSTEMDRIVE%\Boot.ini
Under [operating systems] replace the parameter /NoExecute=xxxxx with /Execute
Save the Boot.ini file
Restart your computer
Also, I believe many folks with XP SP2 have GiantAntiSpyware installed.
And, since KAV uses a proxy server, some XP service disabling may affect it's ability to connect.
Having said all that, I dont seem to be able to use KAV at the present time. I had been using an old version of KAV, and manually updating the defs with d/l over at
http://www.majorgeeks.com. They appear every couple of days. Through a convoluted set of steps, you can create a folder (updates) and steer the update action to manual and then to the folder path (after unchecking the KAV server). In this way I could use KAV as an on demand manual scanner. However, I recently updated my version to the Jun 2006 .303 version (not the .308??? given now by AOL), and decided to "light everything up" and see how it did. I immediately started getting all those annoying nag messages that I hate so much with Norton. O.K. so I ran a full scan and updated to latest defs. Then, little by little, I turned off everything but the files protection. I could live with this, but a new prob appeared - KAV was blocking certain websites, "server not found". I dont know if they meant KAV proxy server, or it was blocking the website server. Immediately after closing KAV, I could get into the sites. Turning off html/web scanning did not help. This happened with firefox, greenbrowser and opera.
To make matters worse, everytime I stopped the KAV proxy server from the startup que, it replaced itself at the next boot. So I cant even use it as a scanner. Hmmmmm. I had to uninstall, and will need to explore this when I have more time, perhaps trying the .401 beta. Shoulda left things alone - lol.
Thusly, its back to AVG (Grisoft) for me, nice clean interface, trouble free, about 90% as good as KAV.
I also use protectx for my registry (on), HiJackThis for BHO scans (manual), Webroot spysweeper (manual scans), and Adaware 1.06R1 SE pro (on), and of course, ZoneAlarm. I would not connect to the web without Zonealarm Pro (with the popups that tell you whats being blocked). I have heard Kerio is also good, but I have no pressing need to change.
ZA has some "troubled" current versions (the 6.5 series), so I use old 6.0.631, anything between that and 6.1.744 is gold. Do not confuse with ZA Internet Security Suite.
https://grc.com/x/ne.dll?bh0bkyd2
http://www.grc.com/lt/leaktest.htm
Also the AOL "version" is the "lite" version of KAV which doesnt have all the most advanced features, but may be actually better for everyday use. Its basically free KAV with ads.
Edit:
FWIW: Grisoft (AVG) bought Ewido, so now there is AVG anti virus, AVG+ (with ewido), and AVG Security Suite (w/firewall)