[support] problems with category module

[Sauro Cesaretti]

Hi all,
I'd like to ask some clarification about the module category.
I have installed that module in drupal 5.7 and after some days I 
discovered a conflit with the simplenews module  so I decided to disable 
them both.
I was able to remove simplenews using the normal unisntall link in 
modules section but I was not able to remove the category module.
Could you suggest me something for that?
Thank you very much in advance
best regards, Sauro