1. First try to find the Apple mobile device service in Computer Management and start it manually. Right-click "computer"> "manage"> "services" and "Applications ". Program -Service: Find the Apple mobile device in the service item and start it manually. 2. If the above method does not work, or the Apple mobile device Support Program is not installed on your computer, you can download and install it online. After installation, restart your computer. 3. If the first two methods do not work, you may need to reinstall the iTunes file. The method is somewhat complicated, as follows: use the "control panel" to uninstall iTunes and related software components in the following order: 1. iTunes 2. quickTime 3. apple Software Update 4. apple mobile device support 5. bonjour 6. apple Application support (iTunes 9 or later) may receive various warning messages if you have not uninstalled these applications in the above order or only uninstalled some components. Steps for deleting and reinstalling iTunes and related components: delete iTunes note: the items purchased from the iTunes store or songs imported from the CD are stored in the "my music" folder by default, this content is not deleted when you delete iTunes. 1. Exit iTunes. 2. Select the control panel from the Start Menu. 3. In control panel, open add or delete programs ". 4. Select iTunes from the list of programs currently installed, and click "delete ". 5. When the system asks if you want to delete iTunes, select "yes ". 6. After the uninstallation is complete, Do not restart the computer as prompted. 7. If other iTunes program items are listed in "add or delete programs", delete them together. 8. In addition, delete all iPod update applications listed in "add or delete programs" in the same way as those listed in the deleted iTunes. Delete QuickTime 1. Exit QuickTime player. 2. Select the control panel from the Start Menu. 3. In control panel, open add or delete programs ". 4. Select QuickTime from the list of programs currently installed, and then click "Uninstall ". 5. When the system asks whether to delete QuickTime, click "yes ". 6. After the uninstallation is complete, Do not restart the computer as prompted. 7. If other QuickTime program items are listed in "add or delete programs", delete them together. Delete Apple Software Update 1. Exit Apple Software Update. 2. Select the control panel from the Start Menu. 3. In control panel, open add or delete programs ". 4. Select Apple software update from the list of programs currently installed, and then click "Uninstall ". 5. When the system asks whether to delete the Apple Software Update, click "yes ". 6. After the uninstallation is complete, Do not restart the computer as prompted. 7. If other Apple Software Update Program items are listed in "add or delete programs", delete them together. Delete Apple mobile device support 1. Select Control Panel from the Start Menu. 2. In control panel, open add or delete programs ". 3. Select Apple mobile device support from the list of programs currently installed, and then click "Uninstall ". 4. When the system asks if you want to delete the Apple mobile device support, click "yes ". 5. After the uninstallation is complete, Do not restart the computer as prompted. Note: Do not manually delete the mobile device support folder in c: \ Program Files \ common files \ apple. Follow these steps to use "add or delete programs ". Delete bonjour 1. Select Control Panel from the Start Menu. 2. In "Control Panel", click "add or delete programs": 3. Select bonjour from the list of programs currently installed, and then click "Uninstall ". 4. When the system asks whether to delete bonjour, click "yes ". 5. After the uninstallation is complete, Do not restart the computer as prompted. Delete Apple Application support (iTunes 9 or later) 1. Select Control Panel from the Start Menu. 2. In control panel, open add or delete programs ". 3. Select Apple application support from the list of programs currently installed, and click "Uninstall ". 4. When the system asks whether to delete the apple application support, click "yes ". 5. After the uninstallation is complete, restart the computer. Verify that you have uninstalled iTunes and related components. 1. Restart your computer. 2. After the computer restarts, open "Local disk (c)" in "My Computer" or the hard disk with these programs installed. 3. Open the "Program Files" folder. 4. Right-click the iTunes folder and select "delete". Then, when the system asks whether to confirm the deletion, select "yes ". Note: If you have successfully deleted iTunes, the folder may have been deleted. 5. Right-click the iPod folder and select "delete". Then, when the system asks whether to confirm the deletion, select "yes ". If you want to continue with windows, click "continue ". 6. Right-click the QuickTime folder (if any) and select "delete". Then, when the system asks whether to confirm the deletion, select "yes ". If you want to continue with windows, click "continue ". 7. Right-click the Bonjour folder (if any) and select "delete". Then, when the system asks whether to confirm the deletion, select "yes ". If you want to continue with windows, click "continue ". 8. Open the "common files" folder. 9. Right-click the apple folder (if any) and select "delete". Then, when the system asks whether to confirm the deletion, select "yes ". If you want to continue with windows, click "continue ". 10. Enable "Local disk (c)" in "My Computer" or the hard disk with the operating system installed. 11. Open the Windows folder. 12. Open the System32 folder. 13. Right-click the QuickTime file (if any) and select "delete". Then, when the system asks whether to confirm the deletion, select "yes ". If you want to continue with windows, click "continue ". 14. Right-click the quicktimevr file (if any) and select "delete". Then, when the system asks whether to confirm the deletion, select "yes ". If you want to continue with windows, click "continue ". 15. Right-click "recycle bin" and select "Clear recycle bin ". Reinstall iTunes and related components after you confirm that you have completely uninstalled iTunes, you should download and install the latest version of iTunes. If the message "Cannot delete *******: another person or another program is using this program" appears when deleting a folder, follow these steps. 1. Make sure that the iTunes and iPod update utility is not enabled. 2. Press Control-alt-Delete. Select Start task manager ". 3. Click the process tab. 4. Search for programs that cannot be deleted in the list. 5. Click the program and select "End Process ". 6. Exit the task manager. I only used the first step to solve the problem.