can't install dia for windows

["valvarez adinet com uy" <valvarez adinet com uy>]

Hi,
I've followed de instruccions on the page http://dia-installer.
sourceforge.net/ but I still can not install dia for Windows.
It's installed (OK), GTK+ Runtime Environment 2.6, because I'm using 
Windows 98.
When I try to install dia (dia-setup-0.95-1.exe or dia-setup-0.95-pre4.
exe) an error messagge appear: Error! Can't initialize plug-ins 
directory. Please try again later.
Some places suggest to verify if there is a problem with temp 
directory, I confirmed there isn't any problem.
I've also tryed on another Windows 98 PC with same results.
What can I do?
Thank you very much for your support.
Ma. Victoria Alvarez