I do not think a reinstall will help in your case. When you cannot rename folders this looks like a configuration problem.
This is, where we come to the issue template, which was shown when you created your posting, which - unfortunately - you decided not to fill in.
For your convencience, here are the relevant parts again. Especially the owncloud.log in your data directory contains important information. Without this I’m afraid nobody could help you.
Storage backend (external storage):
Please use Gist (https://gist.github.com/) or a similar code paster for longer
Template for output < 10 lines
Web server error log:
Server logfile: ownCloud log (data/owncloud.log):
Additionally provide the output of
ls -laz /path/to/your/owncloud/installation