Have been running Skydrive on my Laptop (W7), Desktop(W7), IPad and Windows 8 phone, but since having to reinstall windows, and therefore reinstall Skydrive, on Laptop am unable to sync/fetch files.     Followed instructions to right click on icon in notification area and go to settings etc, but the option to select 'Let me use SkyDrive to fetch any of my files on this PC' is inactive/greyed out.......Any ideas please?