I haven't seen the previous post and I lost 1 hour to make it work. Because it is slightly different here it is in case the instructions above doesn't work ( i posted these instruction in another topic but well still might be useful):
If anyone has troubles connecting and making cms60 D connect to a computer here is the way for win 7 64bit. SHould work with other operation systems and cms models too.
first install the SPO2 Assistant software from the disk that came with the device. then UNINSTALL the Silicon labs cp210 driver like you are uninstalling a program (just search for the CP210...).
Download the cp210 USB to UART bridge driver from [silabs"dot"com/products/mcu/pages/usbtouartbridgevcpdrivers"dot"aspx] replace "dot" with . in your browser... by clicking download to the one corresponding to your operation system (win 7, 8, or XP) and mind the version 32 or 64 bit! then double-click the file and extract to a folder of choice. go to that folder and install the 32 or 64 bit version of the driver depending on your operation system version. Start the SPO2 Assistant software. Click on connect (the first big button that looks like a cable connector RS232) then start the CMS60D device (the actual oxymeter). Be prepared to click on the PC taskbar the driver installation icon!!! you should be quick once you connect the device to the computer. Now, beeing prepared, connect the cable to a pc Usb port. When the computer starts looking for the driver, click that icon (the rotaing green ball), from the open window click on the text at the bottom to skip obtaining driver form windows update!!! - otherwise for me didn't work. Wait until it finishes installing the driver that you have from silicon labs. When it says "ready to use" or something like that, close that window and click refresh in the SPO2 Assistant window (the connect to device sub-window that is still open) within 2-3 seconds you should see one device in the list. click on it and then press the button connect. That's it - done -working. Honestly. It took me 1 hour and I hope I save you (whoever you are) some time. Be healthy!!!
Panayot