[Q] [HELP]Package file is invalid error

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http://forum.xda-developers.com – playstore is giving the error "package file is invalid" for almost all the apps i download. i've cleared cache, restored it to default, used a different apk and finally restored it back to factory settings. still the same error. also tried this method Quote: 1). Log into Google Play Store (using a browser) 2). Scroll to the bottom of the page & locate "My Orders & Settings" 3). Click on the Settings Tab 4). Assign a "Nickname" to your phone 5). Check "Shown in Menus" 6). Save settings 7). Return to the Pl (HowTos)