I'm aware of the limitations of signature-based antimalware programs. Especially since the volume of the signatures is rising quickly, and real-time software such as McAfee can be real resource hogs. Usually not while surfing (CPU usage), but at startup, updates and at times when it seems to communicate with, for example, McAfee. Please keep in mind that I have a 5 year old computer, processor AMD Athlon(tm) XP 2800+ CPU plus 512 MB RAM. One core, probably 32 bit ! I know RAM is cheap, but I'd rather not add any RAM to this old computer (there can be BIOS/mainboard/chips issues). Windows XP Home Edition SP2. I also have a wireless connection that uses firmware, it's not set up by some Windows wizard. For example, it can't work in safe mode, and it can have issues with security software. I also use IE 7, and I'd prefer not to switch to Firefox. I don't plan to renew my current security software, and as the title suggests I'm considering other approaches. Something plain, simple, stable and secure. I'm thinking about rollback/virtualization systems. A probably ideal approach would be starting a session and closing it without allowing any malware (or other changes) to get on my computer. For example, I would close a session, start a new one, pay by credit card, close the session without my credit card data being present afterwards. I don't want to try all software ... I'm not sure about the differences between rollback and virtualization software. I know many like Sandboxie, but it may not be secure enough. I want something with 100% security, without loopholes, and it doesn't have to be free. I've read about Returnil, but it claims to be a third layer and complimentary layer as a security approach, or something like that. Aside from keeping a firewall, why would I need more security software ? I'm not in the habit of downloading software from the internet, just emailing, surfing, reading a PDF and such. One thing that occured to me, would I need some complimentary software (signature based?), for when I make a payment, in case the website is infected, or for email ? Please keep in mind the limitations of my computer. What programs would be worth considering ? Suggestions are appreciated.