To "reinstall" Steam, you simply delete everything in your Steam folder except the steamapps folder (so you avoid to re-dowanload every game) and steam.exe (if you run it afterwards, it will download all the missing stuff).
Btw: That's the default answer you get from Steam support if you contact with any problem, even if your problem is not the least related to a faulty installation or startup problems. (your experience may differ)
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So delete everything except for steamapps, steam.exe, and userdata?
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it's saying that the procedure entry point av_asprintf couldn't be located in the dynamic link library avutil-51.dll
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