@Doctor Who:As what I've said, the problem exist on virtually all antivirus software except Microsoft Security Essentials (where they use .MSP files that'll update installer database too). So the blame can hardly land on Sony. The problem only appears worse for Kaspersky because their antivirus solution roots deep in the system. So if one part of component buried deep in system is not removed, and it expected to see another components and found they're not there, it'll throw out errors. And errors in parts like device driver hooks can prevent them to work. It's that simple.
If you'd called their support and they accepted your removal support request, after you follow their instruction to remove any remining parts that's not cleaned, your keyboard and mouse should work again.