Dave hit on the 'find the machine' issue earlier, when he said 'try another USB port'- have you tried that?
Your machine is considered by your computer to be a "USB serial port" device. When you install these Chinese programs, it picks an available COM port# to use. All of your USB ports have a COM port number assigned to them. You just need to find the right USB port number that matches what your machine picked out!
In my case, it picked COM3, and it's one of the USB ports on the back of my win7 computer. If I plug the machine into any other USB port, the machine won't connect...
I'm curious if the computer that's running the new machine has LPT or serial (COM) ports?
With your laser turned off, go into your device manager, and see if you have a "Ports-COM & LPT" listing. If you have LPT or COM ports, you will. If not, you probably won't...
Now turn the laser on. If it's actually connected to the computer, you SHOULD have a "Ports" listing pop up (if you didn't before), and clicking on the listing, it SHOULD say something like "USB serial port COM#", the "#" will be the number assigned to the port you're plugged into. If YES to the listing additions, then your computer IS connected to the machine. If the machine says the computer isn't found, then you need to try another port!
OR- just avoid all the above and just try other ports!