SkyDrive troubleshooter

Run the SkyDrive troubleshooter – which it always just ticks the “SkyDrive restart and Maintenance” – no other issues found



Sign in to http://skydrive.live.com
In the navigation pane in SkyDrive, click your Computer (the one with the problem)
Click Disconnect
Run your SkyDrive App
Click Get Started
Enter your login information and click Sign In
Click Next and choose Use this location.
Click Done.

You may also try reinstalling your SkyDrive using a fresh installer and to increase the syncing performance of your SkyDrive, please do the steps below.
At the far right of the taskbar, in the notification area, right click on the SkyDrive icon. (You might need to click Show hidden icons to see all of your icons.)
Click on Settings
Click the Performance tab
Uncheck the box next to Improve upload speed by uploading files in batches.

If the issue even persists after reinstalling your SkyDrive, clarify if you've used "selective sync" option after installing SkyDrive and if you can see recycling blue arrows on your files, and specify which files are not syncing (Office files, photos, etc.).