i didnt find any menu in apps -.-
Welcome to Android Central! Which post are you referring to? If you're referring to mine, what I meant was to go to
Settings>Apps>All, select Google Play Store, and Clear Cache/Clear Data, then Force Stop. Do the same for Download Manager.
In addition, when you are in the
Settings>Apps screen, tap the menu button (the 3-vertical-dot button at the upper right), and tap Reset All App Preferences.
Another possible fix is to go to
Settings>Apps>All, select Google Play Store, and Uninstall Updates. If that works, then see what happens when the Play Store automatically updates itself again. If the problem recurs, then there's some problem with the current Play Store version, and it's worth reporting the problem directly to Google.