Thank you for answering me!
I think there's a conflict among Ge viewer and Weasis. It seems that the workstation does not upload java software cause it has no admin permission but, in this case, why you can see the images only the first time you install Weasis? I don't know why the phisician doesn't use PACS images instead of the burned ones but my problem is: why he can't do it.
Sorry if I didn't give you more detailed info.