most of the problems I encountered during the installation (and afterwards) were caused by the installed Antivirusprogram - whenever installing drivers, deactivate the AV for the time being! (Rather do a scan afterwards to make sure that you didn't catch anything funny while updating without ...)
Of course the whole upgrade from Win7 should have been done without AV in the first place (yes, I also have a bad feeling connecting to the internet without protection, but sometimes you just have to take a risk )
Make sure to download the respective Win10 drivers from the homepage of your manufacturer if provided, and make sure that Win10 doesn't install it's own drivers afterwards AGAIN over the others, if they work. Just note the date and version as depicted in the device manager.
For example with your wireless problem: uninstall the current driver (AV off!) with the device manager, and install your own afterwards; if you don't have your own, just use "actualize driver": with the AV off there is a good chance it will install and function correctly even if it was the same MS driver you used before.
Repeat the procedure with all the other devices that seem to cause a problem.
And make sure that Win10 doesn't replace the installed drivers with it's own again thru normal updates, when you usually have AV on - the same problem might just come back. Just google and use wushowhide.diagcab.
There could be a lot of other issues involved (BIOS type and settings, (not-)installed software, etc), but this is just a hint for the beginning.
Greetings from Germany,