[TEAMSPEAK 3] "MSVCP140.dll was not found" fix
https://support.microsoft.com/en-us/help/2977003/the-latest-supported-visual-c-downloads
In almost all cases x64 is what you want, unless for some reason you're still stuck on a 32 bit system and thus use the 32 bit client, in which case you'd want the x86 download.
By a user named "Chris" on the teamspeak forums.