The first possible solution I would attempt, depending on how long ago this occured, is a system restore, to a restore point prior to the time "the day I started to play in the Windows registry". If that is not an option then perhaps
Open device manager, expand network adapters select each adapter and right click and uninstall, then right click on the command prompt shortcut and choose run as administrator, then type sfc /scannow then reboot the machine and wait till the hardware wizard reinstalls your network adapters and see if that helps.
I probably don't have to tell you this now, but in the future, before editing the registry always, back it up, create a restore point and export the particular key to your desktop or other safe...