When I touch a element Revit 2011 says:
Element 344449(not always the same number/element) became corrupt at some time before this session. ), what can I do about it.
When I so save recover, revit says:
there is not enough space on drive C: to create the temporary files that revit needs. Either free up space on this drive, or redefine windows user variable TMP to be a folder another drive with more space.

What Can I do about it ?