Thanks for the quick reply.
For the quests, this is the address I use:
http://projecteqquests.googlecode.com/svn/trunk/quests
For the DB i use:
http://projecteqdb.googlecode.com/svn/trunk/peqdatabase
Whats wierd to me is that I was able to checkout everything once on each of my computers, but after that, i got the error.
Edit:
Also using silksvn I used the google command given on the website but got the same error
svn checkout
http://projecteqdb.googlecode.com/svn/trunk/ projecteqdb-read-only