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1 post is enough, this is a volunteer sight and the people that know how to fix your problem, probably are not on right now.
To check windows firewall got to ( Start, control panel, Security center)
Check In "Device Manager". Go to your wireless device, and check out properties. There may be a setting under the power management tab that lets Windows shut it down to save power.
There may also be a setting, for always on.
Our real experts may have more, later.