"Access to the path ..\DispForm.aspx is denied."

Hi, 

At the beginning I installed all necessary language packages in WSS 2.0, so I
had both 1033 and 1055 folders. Then I created two top level sites in these
folders, and both of them was functioning properly. But after some work, I
copied the 1055 folder somewhere else (in order to prevent its original content)
and then I recopied it to its original location (C:\Program
Files\.....\60\Template\1055) I am not sure whether or not this is the actual
cause, but now, when I try to open the items in events, tasks etc., which I
created from Events, Tasks Templates, I always get the same error msg:
"Access to the path ..\DispForm.aspx is denied." or "Access to
the path ..\AllItemsForm.aspx is denied." and so on.. Deleting event-items
and event and then recreating them does not work. 

Do you have any idea about the solution? Any help is appreciated.

Bilge