These days working online has grown in a large number, also due to pandemic many things around the world has turned into digital. And working on digital medium nowadays has become very dangerous,without proper security there could be the various disaster that could cause serious damage to the system. To avoid such accidents Trend Micro is here to take care of your device. When comparing with other security software, Trend Micro has shown a much vast difference of security layers when detecting and taking care of the threat. There is customer all over the world who are enjoying the service by Trend Micro. All level of malware is detected from the software. If it was not for Trend Micro, users would not even have any idea how dangerous it could be for their computer. When users were operating with the premium feature, there was an issue where an invalid serial number was showing after entering the serial number. Let's look at the ways of fixing the issue. How to fix Invalid serial number (Windows) · The first step to re-type and check the serial number. · There are two different ways to get a serial number. Online purchase, retail purchase. If the user is trying with an existing subscription. · For online purchase, the user can re-check the serial number on the Order Confirmation Email. · For retail purchase, the user can look at the 20 digits serial number on the back of the product box. · For existing subscription user will have to log into their Trend Micro account if there are any ongoing license. If there is any other information that users are looking for about Trend Micro, reach out to the Trend Micro Customer Support Number .