I am running Windows 7 Ent. In system and security - action center, it is showing that the action center has dectected one or more issues for review. Under Virus Protection - Windows did not find antivirus software on this computer. However, the pc does have the latest version of Trend, which shows in the supported programs on the MS site. How do I get the system and security to recognize that there is in fact a virus protection installed?

Update Windows and Update Trend and then restart your PC. If problem did not solved, I suggest to contact trend support and ask them to help you.

Please first check if your Trend software is fully compatible with Windows 7. You can check the information from Windows 7 Compatibility Center. If the Trend Micro software is compatible with Windows 7, please update its definitions to the latest version to check the result. Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.