Problems With PGAdmin

Hello everybody,   I'm having a problem with pgadmin II and III. When I try to access a 
database it crash may system and I have to close it. I talk to my 
friends and they have the same problem when they try to acces this 
database. We can access this by a php page or asp but we can't do it by 
the pgAdmin. A frind of mine had a windows program (DBtools Manager 
Professional) that can work without any problem, but it doesn't work 
under linux (even with wine).  How can I fix it? or is there another 
soft for linux that can access a pg database?

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Regards,
Thiago Luiztluiz@agsistemas.com.brhttp://www.agsistemas.com.br