hi all i need little help

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i have i phone games and apps in i tunes format .one time i sucessfully installed in i phone but now every time it gives error some of the 40 applications not installed in i phone

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plz help how can i transfer applications in i phone .....

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Resolution
Check to see if the issue still occurs after doing each step:

Deauthorize and reauthorize your computer

Before attempting these steps, transfer all iTunes Store and App Store content on the device to your computer. Then, use the following steps to deauthorize and reauthorize your computer:

Connect your device to a computer and open iTunes.
In iTunes, select your device in the left-hand column and then click the Applications tab. Verify that Sync Applications is checked.
Choose Store > Deauthorize Computer from the menu bar. Enter your iTunes Store account and password, and then click Deauthorize.
Click Sync in the lower-right to sync your device. When prompted, select Don't Authorize. This will remove all applications and other iTunes Store content from the device.
Note: You may see this prompt more than once. Select Don't Authorize each time.
When the sync is complete, choose Store > Authorize Computer from the menu bar. Enter your iTunes Store account and password, and then click Authorize.
Sync your applications and content from iTunes to the device.
Find more information about iTunes authorizations.

in i tunes showing solution for that but it needs account how can i do that .....plz help

wbr varun

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plz help some one ...............no one is ther who can solve my problem .......wbr varun