The XP Mode package mentioned above, I don't have any experience with, either. The package was distributed by Microsoft mainly for business customers. You have to have Windows 7 Pro or Ultimate (with qualifying hardware) to run it. The majority of Windows 7 users are using the Home Premium version, therefore, we have to find a suitable VM player and a OS to install inside of it. I have 4 of them containing 9 OS's total. I would like to have Windows Virtual PC as described above, my hardware will run it, but I need a Pro OS to run it. But anyway, where I was coming from is, the VM is entirely a different install, a PC within a PC, with it's own programs and AV's. You do have to install an AV within any VM that you run. The VM is powered by the "host" OS, and you can install the AV of your choice within it. That is what I meant. That is not mixing AV programs, since it's (the VM) contained in a "virtual" disk, not like a regular install. With a couple of clicks, the VM and the OS & the programs within it can be deleted. It's that simple, 8 to 10GB of data gone in a couple of clicks, and unrecoverable by any means. That's part of the beauty of the whole thing, no partitions to be made, you can experiment with different OS's, and the best is you can get rid of it all as easy as tossing a can in the trash. The AV that is within the VM has no access to anything outside of the VM, except any hardware that the VM is running (DVD, printer, etc.). It can't scan the entire computer. However, being that you're running an aging OS within it, you do need a quality AV. I have zero experience with Kaspersky, that's why I can't vouch for it. I have nothing against it, either. But I've never paid the AV industry a cent in my lifetime, and as long as there are quality free ones, I'll use them. I pay for my OS, but as far as any other software goes, I research and find the best of the free ones that I can. This doesn't mean I'll install every piece of trash on the market on my computers, I'm selective about what I install. This is the reason that I have a couple of "on demand" scanners that is reliable. Plus, Microsoft downloads us a new scanner every month. Click Start, type "mrt" w/o the quotes, there's another scanner for you. I've had very few infections in the last few years. I've had to trash AV's myself for being unreliable. But you are right, there's enough room for both of our opinions here, and I'm open to ideas of others, as well as mine. However, I don't put my security in one basket, never have and never will. This is enough on this topic for today. Welcome to the forum, David! Hope you enjoy your stay here, this is a great forum here, and a great place to learn, share ideas and help others.