If you're entering into a webpage, your best bet may be a different scanner. Virtual COM generally ties it to native applications (website COM interfaces are possible, but I'm assuming the website isn't yours to modify).
Another possibility is writing a native app that works like a shim: reading from the COM port and using APIs (e.g. SendKeys on Windows) to re-transmit the characters as keystrokes. But the most robust solution is probably a different scanner.
Another possibility is writing a native app that works like a shim: reading from the COM port and using APIs (e.g. SendKeys on Windows) to re-transmit the characters as keystrokes. But the most robust solution is probably a different scanner.