xlive.dll
This file is not a system component: games for windows live, discontinued. Restore it from the source that installed it rather than downloading a replacement.
Do not download this DLL on its own
Searching for a missing DLL by name leads to sites that hand you that single file. It is one of the oldest and most effective malware delivery methods there is, and a system DLL from an unknown source is indistinguishable from a deliberately modified one. There is never a legitimate reason to obtain a runtime component that way.
What it is
The Games for Windows Live client library. Microsoft shut the service down and stopped distributing the installer, so there is no supported source for it any more.
Where you see it: Games from roughly 2007 to 2013 that shipped with Games for Windows Live integration.
Many of these titles were later patched by their publishers to remove the dependency, so check for an official update or a re-release on Steam or GOG first. That is the only clean answer. Because there is no legitimate download left, this file attracts an unusual concentration of malicious copies.
Why there is nothing to download here
There is no verified download we can offer for this one, because installing a file is not the fix. The steps above are what actually resolves it. That distinction matters: the sites ranking for this file name are selling a download that would not have helped even if it were safe.