8.7i p1 supports W7, i think...you'll need agent 4.0 Patch 3 in addition.
("McAfee Agent 4.0 Windows Patch 3 and McAfee Agent 4.0 Extension Patch 3 will provide support for Microsoft Windows 7. Both of these are targeted to begin Managed Release at the end of August 2009. See KB51542 for detailed information on release cycles." KB66706)
8.7i p2 adds support for the security center issue. and it has some performance improvements.