If Steam itself is failing to launch or you still experience odd issues with games not working properly, you might want to try deleting your Client file.
After deleting this file, you’ll have to log back into Steam and other local settings will also be lost – for example, you’ll have to re-categorize your games.
Also, if you've edited your files, it's a good idea to make a copy of those elsewhere as they will also get overwritten.
If you experience any issues while launching the game, please disable all non-essential programs, including any anti-virus software on your computer to avoid corrupted files.
Some older games don’t play nice with multiple CPU cores on modern computers.
To validate a game’s cache, right-click the game in your Steam library and select Properties.
In the properties window, click the Local Files tab and click the Verify Integrity of Game Cache button.
To confirm this, I installed Skyrim Performance Monitor (available on Nexus) and launched my Skyrim game from the program.
Unfortunately, I'm using an ENB, so an in-game counter was not available.
This guide gives solutions to common problems you’ll encounter in Steam, from games crashing or not working properly to Steam failing to launch.