svn vicious circles: can't set file..... read-write:Access is denied/or/working copy locked -> cleanup failed

My machine (Window 2008, CollabNet, TortoiseSvnChapter 1.5.2, Build 13595 - 32 Bit, AnkhSvn) has entered a vicious circle of Svn symptoms and I don't know how to get it out of it :).

It's a fresh client, with a fresh update. Worked for 6hours on the dir 'C:\STELVIO\trunk\SEP\Simulators\SearchEngineSimulator\Test\Microsoft

When tried to update, I get:

*********Error: Working copy "C:\stelvio\trunk\sep\simulators\searchenginesimulator\Test" locked***********

[cid:image001.png_at_01C92A6E.BCAF1610]

I try cleanup and I get:

************Cleanup failed to process the following paths:******************
C:\stelvio\trunk\sep\simulators\searchenginesimulator\Test
[cid:image002.png_at_01C92A6E.BCAF1610]

FAQ:

Question: did you try unlocking dirs? Answer: yes, I unlock it from any process with Unlocker.exe. No difference.
Question: did you try killing TSVNcache.exe? Answer: yes. No difference.
Question: did you try renaming upper dirs (like trunk) while unlocking? Answer: yes. No difference.
Question: did you cleaning up upper dirs (like trunk)? Answer: yes. No difference.
Question: did you try removing the VS add in (Ankh)? Answer: yes. No differentce.
Question: are the same symptoms present if you use VisualSvn add in? Answer: Yes. No adf;slkjasdf :)

[cid:image003.png_at_01C92A6E.BCAF1610]

Sometime the circle of symptoms described above involve starting errors a la: ********can't set file..... read-write:Access is denied****

Obviously, any ***other*** ideas are welcome :).

Thanks,
Pompi