Welcome to Mint
Please don't write everything in one go and please don't mix different types of errors in one post
Because of this I don't fully understand what does not work
You have to tell us more facts.
The minimum is exactly which Mint you have - which version and which edition
(main or any of the CEs)
We also need to know a bit about all your hardware.
Run " lspci " in a terminal and post here (to avoid misunderstanding - the first character is a minor L and you copy by marking with the mouse and then right click - telling you this just in case
Some wifi and possibly built in sound can be connected to USB even if they are internal - if you suspect you have one of these run " lsusb " in a terminal.
Also tell us if this is using mint4win or not, quite important
This is a standard answer so it may not be fully applicable to your situation