Monthly scanning is pretty useless. Why would anyone want malware sitting on their machine for just under a month, giving it time to harvest information such as credit card information, etc.
Keeping a PC secure isn't rocket science and doesn't require several "security" software products.
@unleashed You need to understand how the malware got there in the first place. As you've found out, Security Essentials was unable to stop the infection. This is nothing new. The majority of new malware is FUD (fully undetected), which is why AV is useless in 2012.
Consider using Chrome, if you're not already, as it comes with a fantastic sandbox and prevents Java drive-by attacks unless the user is silly enough to click "Run". It disables out-of-date plug-ins by default. Put Chrome in Click to play plug-in mode. chrome://chrome/settings/content > Plug-ins > Click to play. This'll prevent the majority of drive-by attacks that target plug-ins such as Flash, Reader & Java.
Chrome's malware URL filtering is good, and can be combined with OpenDNS for even more protection.
Secunia PSI will help you keep potentially vulnerable applications up-to-date.
I've been using computers since the early 70s when at the local collage punched cards and tape (before the ZX80 appeared in a home environment) were the order of day. I guess with experience gained over many years and having made more than my fair share of mistakes along the way, I'm generally aware of what is going on and maybe wrong in most situations no doubt similar to mrk.
I agree keeping machines clean it isn't rocket science and we all continue to learn both from experience and discussion with peers such as those on this forum. I believe mrk's suggestion to periodically run anti-malware is worthwhile and may possibly help to detect an underlying threat.
KIA, yes I do understand how malware reaches its victims, however with a few (minimal inconvenience to the user) safeguards’ in place and of course common sense, such occurrences are relatively infrequent in my opinion.
I, and my family, chose to use IE for online activities simply because of its uniform acceptance / compatibility with just about everything I and my family need to do online. To take your argument to use Chrome a little further, I guess we all need to buy MAC or run unpopular OS’s. In addition kids will be kids and use just about anything their peers use and it is almost impossible to have every base covered.
IMO the ultimate safeguard, for me at least, is the ability to perform a bare metal restore of any machine I administer with the minimum of fuss. In addition, the "health” (not just AV status) of all machines on my home network is continuously monitored and reported to the administrator.
Are you running regular back-ups of all home machines you administer?
It's well past beer O’clock and time for Horlicks.