Hey there roland1919!
I'm sorry to hear you've completed some troubleshooting and it still doesn't work. With a little more information we can get it working for you.
It sounds like you are trying to use your Samsung Tab 7.0 Plus as a modem for your computer. Are you attempting to tether your device using a usb cable or set it up wirelessly as a hotspot? Does the computer charge the device?
Thank you and have a great day!