how to disable Advertisements popping up in notification bar(caused by some games i installed)

[charleskvn3]

there are some advertisements of games popping up in my notification bar, some are straight away downloads the apk file and asks me for the installation permission when i connect to the internet. am certain that these are from the games i installed recently. and i found they creates a directory 'sdcard0/Joy', which contains sub directories App,Cache,config,Pic,PopAd
any help to find and remove the app and hence the ad popping problem would be much appreciated. thanks in advance