Have the same issue after upgrading to Win7. Worked fine with Vista Ultimate SP 2, and after a recent upgrade to Win7 Pro, I now get a message that there is no Anti-Virus installed and that I should "Find an anti-virus program online (important)."
Of course Blink is runnng and doing just fine, Win 7 Security Center is not aware of it.
Kinda hate to disable the warnings, did Blink fail to provide some needed hook?