Update pepflashplayer.dll  to latest version

I'm not clear on what you're trying to accomplish.

In the context of Google Chrome, Flash Player is a built-in component, and updates are managed and distributed by Google.  In general, if your Chrome installation is up-to-date, Flash Player should be as well. 

If you're *NOT* using Google Chrome, but something based on the Open-Source Chromium codebase (like current versions of Opera, and Chromium itself), then let's talk specifics.  That said, it sounds to me like you're actually on Google Chrome and it's just not picking up automatic updates like it's supposed to.

You can try to force-update it form here: chrome://components/ 

If that's not working, something is wrong under the hood.  The easiest solution, if you're already logged into a Google account in Chrome, is to just uninstall and reinstall the browser.  Once you sign back in, it will sync all your settings back down from their servers.  It's pretty painless overall.  Their update technology works really well in general, so there's probably an underlying root-cause, like file system corruption, or your disk is on the way out.  It might be worth running the appropriate disk repair utility and/or making sure you have working backups of anything that you'd be sad to lose, just in case.