Unable to decrease Latency to below 27ms Maya44 SE

Hello,
I am mixing with the Maya 44SE on my desktop since some month now but i wanted to test on my laptop since that is why i bought this card.
Unfortunately, if i decrease the latency under 27ms i get a crappy sound.
I have tested on another laptop and there it works perfecly.
What can i do to make it work on my laptop with a good sound under the 27ms ?
The specs of my laptop are really fine, intel dual core 2.00 ghz, 2 Go of memory and a good graphic card.
I have tested the Maya on windows 7 and xp SP3, both gives exactly the same results.
I am a little bit desparate about this issue.
Do you have any idea ?
I am mixing with the Maya 44SE on my desktop since some month now but i wanted to test on my laptop since that is why i bought this card.
Unfortunately, if i decrease the latency under 27ms i get a crappy sound.
I have tested on another laptop and there it works perfecly.
What can i do to make it work on my laptop with a good sound under the 27ms ?
The specs of my laptop are really fine, intel dual core 2.00 ghz, 2 Go of memory and a good graphic card.
I have tested the Maya on windows 7 and xp SP3, both gives exactly the same results.
I am a little bit desparate about this issue.
Do you have any idea ?