Sorry to hear about your problems!
My wife and I have 2 Desktops we share;
1)
Studio DAW, Photoshop and Video. No Internet connection unless I 'must' activate software. And all incoming content such as updates, audio, video and photos are all scanned thoroughly prior to transfer.
2)
Internet....
Since my wife does a lot of cyber-networking with friends and family; E-mails and sharing of photos on a regular basis (daily; morning, noon and night) on average; every month or so I find and remove viruses, most of these viruses are fairly harmless low-risk but still I don't like any of that crap and usually catch them before they cause instability. Another security measure; after each session the cache gets cleaned out and she also uses CClean.
That said; no matter how cautious, no matter how updated the AV and several other security apps are the risks of catching a virus is still quite real.
Updates: Windows, AV, Malwarebyte, Spotbot and CClean updates; on both computers I have it set to;
Manually, I much prefer to check for updates at least once a
week and usually install only important security updates for example; I prefer to stick with my own choice of audio/video players and IE never gets used. I hate having the above mentioned security programs and such running in the background. Also because my wife's PC can get bogged down easily; it's
not a particularly powerful system.
I also run scans when 'I' want and do so frequently about twice a week or more; should I suspect something isn't quite right for example; Adware can diminish performance and adverts appearing on sites that normally should not be there; these are all signs of likely infection.
It's not that computers have advanced so much; are way more powerful nowadays; that I can play games; Halo and Sim City all whilst chatting on Skype; all whilst posting feveriously on forums; all whilst doing a critical mixdown of 120 tracks with 5,000 plugins (sorry, a little overly exaggerated there lol) it's because I don't feel the need to push systems so fricken hard and take security risks. I mean seriously; my system would literally be SMOKING; it probably go up in flames!