ViewVC error after upgrading from 1.4.3 to 1.5.5

I have just finished upgrading my svn server from 1.4.3 to 1.5.5 by
basically removing all old svn components and installing the new ones.
Everything seems to work fine until now) except for the (automatically)
installed ViewVC repository browser that shows the following error message
when trying to access a repository:

---
An Exception Has Occurred
Python Traceback
Traceback (most recent call last):
  File "C:\Program Files\CollabNet Subversion Server\viewVC\lib\viewvc.py",
line 3746, in main
    request.run_viewvc()
  File "C:\Program Files\CollabNet Subversion Server\viewVC\lib\viewvc.py",
line 262, in run_viewvc
    import vclib.svn
  File "C:\Program Files\CollabNet Subversion
Server\viewVC\lib\vclib\svn\__init__.py", line 27, in <module>
    from svn import fs, repos, core, delta
  File "C:\Python26\lib\site-packages\svn\fs.py", line 19, in <module>
    from libsvn.fs import *
  File "C:\Python26\lib\site-packages\libsvn\fs.py", line 7, in <module>
    import _fs
ImportError: DLL load failed: The specified module could not be found.
---
Any help is appreciated!
Thank you,
Dieter
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