Hızlı yanıt: kod örneği
Chrome updates itself in the background. It first renames the current version to old_chrome.exe, then installs the new version, then changes over and deletes the old one. This allows you to go on web-browsing while the update takes place.
If you're seeing old_chrome, then it is in the middle of an update. old_chrome should go away after the update completes.
If it doesn't go away after, say, an hour and a reboot, then something has gone wrong.
Worst case - uninstall and reinstall Chrome.