built in ba yung wireless mo? try mo adjust yung power management.
Start/Control Panel/System/Hardware/Device Manager/Network Adapters/wireless connection/right click then click properties. tapos select mo yung Power Management then uncheck mo yung default tapos move mo yung cursor sa highest value.

try to connect to the internet even your signal strength is low. If ok naman yung connection mo, dont be bothered by the low signal. sakin kasi ganun eh.