Why Add/remove program do not uninstall program completely?

[luminore]

I have uninstalled unnecessary program via Add/Remove program, but find that
there is still remains application folder,

C:\Program Files\Application_name
Why uninstalling is not clear?
Is the manually removing this folder 100% safe?

thanks

 

[Alan Edwards]

That is the fault of the uninstall that came with the application and
it is not uncommon. I delete the application folder that is left
behind when that happens.

....Alan

 

[Rock]

I have uninstalled unnecessary program via Add/Remove program, but find that
there is still remains application folder,

C:\Program Files\Application_name
Why uninstalling is not clear?
Is the manually removing this folder 100% safe?

thanks

That's typical and a result of the uninstall application written by the
program vendor, and not caused by the XP OS. Many don't fully clean up
after themselves. Manually delete the folder after first checking to
make sure there's nothing inside you need.