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Try going to the update function for your TrendMicro software - if it will open a window for the program first, there ought to be such a function in the TrendMicro program's window.
Try the update function, then see if it still insists it is expired.
Also if there's a 'review subscription' or 'check subscription status' function there, try that first, before also doing an Update.
Let me know how that goes, or if that is not possible, why it is not possible (e.g. program window won't open) and I will instruct you further.
Look at the lower right of your computer's screen. Is the icon for Trend-Micro findable there?