I'm getting the error message "You have exceded your profile storage space."
This means that you have exceeded your profile's quota of 3GB and that the profile can no longer be synced with the profile server. Your data is still accessibly locally on the machine, but only there.
To resolve the problem you should move some data to a network share, e.g. ("storage") S:
.
This problem can be avoided by not storing large amount of data on your Desktop or in folders like Dokumente, Downloads,..., but instead on S:
or H:
.