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The Action Center in Windows 7 shows that antivirus, antispyware or firewall is not installed when they are in fact installed and working normally.
Due to a change to the Security Center interface for ISVs, some antivirus, antispyware, and firewall programs could be incompatible with the Action Center in Windows 7.
New APIs were introduced in Vista SP1 that implemented new API's. More information on this case be found at the following link:
Upcoming Action Center Changes for Security Vendor Software
http://windowsteamblog.com/blogs/windowssecurity/archive/2009/05/06/upcoming-action-center-changes-for-security-vendor-software.aspx
If the application vendor does not use the appropriate API's, the Action Center will not show that the product is properly installed.
Looking in the internet multiple customers are reporting this issue. This issue has been seen specifically with McAfee antivirus.
Action Center keeps reporting my antivirus is turned off, even though it is still running
http://answers.microsoft.com/en-us/windows/forum/windows_7-security/action-center-keeps-reporting-my-antivirus-is/21f21318-9743-4e54-a3f3-9207fe754e29
Action Center False Issues
http://answers.microsoft.com/en-us/windows/forum/windows_7-security/action-center-false-issues/fffb0d5d-c566-4f49-8205-faf85031d042
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