HD Install :: Swap unused ??
No, because if I do nothing it's 0% and if I do multiple tasks it's 0%
and when I boot the pc it say "swap activated" 
My guess, then, would be that your tasks aren't using much ram? DSL itself is very light, and if you are using light apps you could do quite a bit with that 64mb.
Another possibility is maybe the application you're using to monitor is not working properly. Do you see anything about swap if you use the "free" command?
waw
Swap :
total: 0, Used: 0, free: 0
...
Well, run Firefox, Opera, XXMS altogether and see if you still have unused swap!
If free is telling you that there is a total of 0 swap, then i suppose it's not being used. You might need the command "sudo swapon" to enable it.
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