unplug and power up dsl modem and router

Hello,
This is happening more to my wife's new Toshiba laptop running Vista than to
my Dell laptop running XP-SP2.
The computer will loose access to the internet, and the fix is to unplug the
power to the DSL modem and the wireless router, wait a few seconds, re-power
the modem and router, wait 3 minutes then start Internet Explorer. This has
always fixed the problem, but I would like to better understand the
underlying cause. This started happening more often after my wife got a new
Toshiba laptop. It often happens that my Dell laptop is still connected to
the internet. At first I thought that since only her computer was having a
problem that there must have been some problem with her computer and that
turning power off and on to the modem and router would not be the fix, but
it was the fix after all. I guess there is some part of networking here
that does not make sense to me, probably because I do not know a lot about
networking.

Is there some other way to attack the problem to make it happen less
frequently?

Also, I looked for a Vista help newsgroup, but could not find one.

TIA for any help,
Tom


.

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