longtab,
I'm assuming your desktop doesn't lose it's connection (hard wire, right?) after awhile. If it does, it's a sign that your router is going out (usually heat related).
Okay, so a laptop loses it's wireless connection after awhile. This is a common problem because some manufacturers build in a 'sleep mode' for internal wireless adapters when they haven't been used and some drivers for external cards do the same. They call it a power saving feature, I call it a pain in the ass.
Unfortunately, I can't tell you exactly where that setting is. Check in your battery settings (some manufacturers have their oem package that manages this), check your wireless network settings (there might be a checkbox there), and anywhere else you can think of that it might be. Sorry that I can't be more helpful about finding this little setting.
This may not be the problem though. Different network cards react to routers different than others... I had one that would drop the connection randomly and I would have to disable the adapter and then enable it to get it to accept connections again. The wifi network type was 'open' with no WEP key. When I changed the router to be 'shared' with a WEP key, my connection no longer dropped. So, try changing up some of your router settings such as channel and connection type and see if that makes a difference.
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