To Install Trend Micro Internet Security, you have to Click "Windows 7 (32-bit)" or "Windows 7 (64-bit)" depending upon the operating system you are using. After that, Click "Download" in the Download Installer window. Then, Click "Save" and "Run." Next, Click "Continue" when the User Account Control window opens. Forth, Click "I Accept the Terms of the License Agreement" and "Next." After that, Type your serial number into the field provided and click "Next." You need to Note that your serial number can be found on the inside of the box or in your Order Conformation email. Then, Click "Regular Installation" and "Next."