After upgrating to 7264, Kaspersky 2009 KIS would not even start, Windows 7 is blocking allmost everything in KIS. Emailscanner was running, and that was it AIR. Everything else was stopped by Windows 7 at boot, with a warning of incompatiblitet of programs and services.
I have payed for the key to KIS, so I would like to use it, but it seems not possible for now. In earlier builds KIS gave some oldtime info back to Windows, but it worked.
I now use the free Avast and the buildin firewall of Windows 7, and it seems to do OK.
I know Kaspersky has a betaversion with no support build for Windows 7, but I have never seen any tests with it, so I don't know how secure it is?
I do hope Kaspersky will release something that can run in windows 7 when it is going retail.