Sometimes when I would open my Excel spreadsheet up on SkyDrive, I’d get a message saying that the document was open by another user and that I could only open it read-only, save as another copy, or cancel, or whatever, even when I did not have the document open at all. This would be really annoying. Sometimes I would reboot my box and the problem would be fixed. But now, try this:
1) From Task Manager, find this process:
2) Right click and select End Task
3) Problem solved 🙂 – well hopefully, worked for me last time.