Evitative :
adamwinn :
could be a power management issue, or more likely a driver issue. Are you running the latest drivers for the adapter?
How do I check ifor both?
Let me know what your wireless adapter and driver are:
Right-click anywhere outside the start app buttons.
In the All App button, select the switch to all app menu item.
Select Control Panel.
Click System and Security.
Click Device Manager.
Click + Network Adapters to expand the section.
The wireless adapter is listed. For example: Intel® Centrino® Advanced-N 6235.
Right-click the wireless adapter.
Click Properties.
Click Driver tab to see the wireless adapter property sheet.
The driver version number is listed in the Driver Version field.
Get the driver version number, and the adapter name. PC model won't hurt either.