Reinstalling your Steam client can help you fix issues with the Steam files or operating system compatibility problems.
You can temporarily disable your antivirus and check if the problem persists.
You can’t play the games in your Steam library now! The following are the methods that have helped many Steam users. So when you launch Steam later, your operating system thinks the same processes have already been running and refuse to launch the client.
And you will desperately want a solution to fix this issue. To open your Steam client normally in these cases, you should end all tasks of Steam in Task Manager before launching it.
You can download and install your drivers by using either Free or Pro version of Driver Easy.
But with the Pro version it takes only 2 clicks (and you get full support and a 30-day money back guarantee):1) Download and Install Driver Easy.2) Run Driver Easy and click the Scan Now button.