回复：奇怪的事情，寻求答案

1. 这种事情发生的可能性有多大？

Possibilty 100%, probabilty unknown

2. 如何找出你的电脑是否被远程监控？

To start:

Reboot your PC, do not open any browser or anything else, fire up a command window, type in "netstat -an", if you see a whole bunch of "foreign address" other than your own ISP's IP or 127.xxx.xxx.xxx, chance is very high that you are bugged.

Also check "Computer Management" to see if there is anything looking suspicious

3. 什么程序/设置可以远程监控你的电脑，知道你新添的电子设备，以及你们的谈话内容？是通过router的设置还是别的什么东西？

Many many many things can achieve that...

By design, Windows 8 can be used to monitor you...

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I'd suggest back up your PC's data, and then wipe it out by reinstall it from scratch...

sorry I can not answer any more detail question, you'd have to goolge it yourself...