If you want to sync some devices in Windows 7 using the Sync center you’d first have to enable offline files.

Enable Offline Files For Sync Center

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Using Offline Files

1. Step Open the Start Menu and click the Control Panel link

Control Panel Link On Windows 7 Start Menu

2. Step On the top right select Small icons from the dropwn

Change Control Panel To Classic View

3. Step Find the option Sync Center and select it

Sync Center Link

4. Step On the left hand you can find the option Manage offline files

Manage Offline Files

5. Step Finally, click the button Enable offline files, confirm the UAC prompt and hit Apply

Enable Offline Files

6. Step You have to reboot to activate Offline files and sync offline files using the Sync Center