Make sure to change all your passwords *after* passing malware and virus scans, otherwise you'll probably be doing more harm than good if you give a keylogger all your new passwords.
Antivirus doesn't run on your monitor, it runs on your actual computer. You seem to be under the impression that a monitor can execute code through display cables.
It's common for software licenses to prohibit decompiling and reverse engineering. This is often to protect intellectual property rather than to hide malicious content. If they wanted to share the code freely, they'd open-source it. That doesn't mean that all closed-source programs are malicious.
This did not break your monitor. I'd call this "coincidence" but you even said that your monitor broke a whole month or two after you installed this, so it's not even related. There is nothing in this program that remotely has the technical ability to break a monitor.
