Problem with opening public folder.

Hi,

I have a problem with exchange 2000, when I try to open public folder
I get this error:
object is no longer abvilable pres F5 to refrsh the display and try
again
IDnr: 80040e19
Exchange system manager.

I did try evry thing I could find on google or MS but still I have the
same problem.
We have the urlscan installed on our exchange 2000, but when I look at
my urlscan.log I see nothing that help:

03-29-2007 - 09:20:44] ---------------- Initializing UrlScan.log
----------------
[03-29-2007 - 09:20:44] -- Filter initialization time: [03-13-2007 -
14:32:09] --
[03-29-2007 - 09:20:44] Client at 132.229.35.122: URL contains
sequence '%', which is disallowed. Request will be rejected. Site
Instance='1', Raw URL='/exchange/postmaster/Inbox/omnibus
%20%25REAL_DATE[%25TIME].EML'
[03-29-2007 - 13:29:12] Client at 213.169.107.101: URL normalization
was not complete after one pass. Request will be rejected. Site
Instance='1', Raw URL='/epubnbb2/uploads/images/Brab%2520bio
%25206_LAAT_afb%2520coll%2520auteur.jpg'
[03-29-2007 - 15:14:59] Client at 82.171.200.80: URL normalization was
not complete after one pass. Request will be rejected. Site
Instance='1', Raw URL='/epubnbb2/uploads/images/Brab%2520bio
%25201_SPEYART%2520VAN%2520WOERDEN_afb%2520Gerecht shof%2520DB.jpg'

I did try this kb's as we:kb282125, kb/282125, 325920

Any idea how to solve this proble?

Thanks,

Shahin