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Assuming its a newer Dell with the Intel wireless in it, a couple of things you can try (assuming you're using windows):
First, I'd crank up the power management to highest, will give more performance and does actually help.
Second, If you're in a mixed environment, you can try forcing what you're listening for (either 802.11b or 802.11g) instead of both.
Finally, Mixed mode protection might be for you if you're near a busy network.
There are newer drivers out on intel's website as well, they may or may not help. You may also want to double check that your transmit power is at it's maximum as well.
All of these settings are founder under network card properties, hit the configure button next to the card name.
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