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https://appuals.com/fix-error-code-51-game-failed-to-start-on-steam/
Did you try every one of those things on that link I gave?
What was the result of each one? Please give details as it will help offer the advice going forward.
Otherwise you#'ll just be randomly flailing around not knowing what's going on.
So please report on each.
Log out.
Delete everything except the Steam.exe, Steamapps folder. Bonus... userdata folder holds screenshots you haven't uploaded. Save that if you like.
Click on the Steam.exe .
More in depth how to here...
https://support.steampowered.com/kb_article.php?ref=9609-OBMP-2526
old code list explan it as suspended, whatever that means, its like you block it
try add it to AV , to see if that help steam.exe or run as administrator then start steam.
do not have other special settings added in compabilitise from the past. even that can be seen security issue.
its run once as admin on the steam.exe not set setttings.
Anti-virus app
EDIT...Ninja'd