Unable to connect to Windows computers on local network

We have several Windows XP computers on our local network. Some have shared folders, that we can upload/download files to/from. 
Connecting to these Windows computers was no problem under Snow Leopard, but under Lion I cannot connect to any of them.
The shared computers show up in the Finder. I can see them in the sidebar, under the "SHARED" items. But I cannot connect to them.
If I select a computer to connect to, the Finder pops up the following error:
There was a problem connecting to the server "name".
The server may not exist or it is unavailable at this time. Check the server name or IP address, check your network connection, and then try again.
Also, I get the following error message in the system.log
Finder: SharePointBrowser::handleOpenCallBack returned 57

Unfortunately it does not work for me.
I can see the server in the Finder under the "Shared" list.
If I click on the server, the Finder gives me the error message I mentioned above. If I click "Connect to server" button nothing happens, but I get the same error message in the system.log. If I select the "Connect to Server" option from the "Go" menu I get the same errors. So I still cannot connect.

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