TortoiseSVN Commits failing: “The file or directory is corrupted and unreadable”, “Attempt to write a readonly database”

I have been using tortoise svn for a couple weeks now.

I get errors very often. Almost everything I do creates an error. this is with repositories on the internet, locally on my machine or a machine on the network. So I started to keep track. Some examples are below.

12/31/2010

Can't move
'C:\Users\jisaacks\Desktop\my branch
test.svn\tmp\entries' to
'C:\Users\jisaacks\Desktop\my branch
test.svn\entries': The file or
directory is corrupted and unreadable.

01/04/2011

Commit failed (details follow): Server
sent unexpected return value (405
Method Not Allowed) in response to
MKCOL request for
'/svn/kranichs-svn/!svn/wrk/b316f15e-0869-4644-9c53-87aa0103506b/branches'

01/06/2011

Can't move
'C:\Users\jisaacks\Desktop\DVD
Catalog\vendors.svn\tmp\entries' to
'C:\Users\jisaacks\Desktop\DVD
Catalog\vendors.svn\entries': The
file or directory is corrupted and
unreadable.

01/06/2011

Can't move
'C:\Users\jisaacks\Desktop\DVD
Catalog\cake\tests\test_app\views\layouts.svn\tmp\entries'
to 'C:\Users\jisaacks\Desktop\DVD
Catalog\cake\tests\test_app\views\layouts.svn\entries':
The file or directory is corrupted and
unreadable.

01/06/2011

Commit failed (details follow):
attempt to write a readonly database
attempt to write a readonly database

That last one about the read only database happens every time I commit. Say if I am working on the head revision (7) in a working copy. I make a change and commit it. It gives me this error. But if I look at the log it tells me that there is now a revision 8 (the commit I just made) but I am still on revision 7. So I need to run update to be on the current revision that I just commited. I hope I explained that clearly.

Anyways with all these errors I wonder.. Is TSVN just this unstable, does everyone have these issues. Or is it just me? If just me, what could I be doing wrong?