This document describes some simple steps for dealing with Windows 7 system and start-up problems.
Just work through the sections in turn until you find something relevant to your problem.
If you computer has system problem, you first priority should be to make sure you have up-to-date backup copies of all your own files.
If you upgraded from Windows 7 or 8.1 within the last 30 days, there’s a simpler method of rolling back that takes very little effort, and doesn’t delete your files, which you can read about on the second page of this post.
Most users will need to actually install an older version of Windows, or switch to Linux, in order to uninstall Windows 10 without leaving behind a blank hard drive.
In some cases, the network connection may look as if it is partly working, for example it gets assigned an IP address from the DHCP service, but application software such as a web browser cannot retrieve web pages.