Futsal,
Can you run Network Interface and post that information back here.
Go to Drivers & Downloads enter your service tag number, then select your operating system. Under Network, download and install the latest drivers.
Try these tweaks....
Bit the Windows key and the x keys at the same time, device manager. Click on Network and then right click on your wireless adapter, left click properties, power management. Uncheck the box, allow computer to turn off this device to save power.
Click on advanced, Look for Antenna Diversity. Some adapters have this and some don't if your adapter(s) have this, change it from Auto to Aux. (Can you also tell me if your adapter has this or not, for my notes. Thanks)
Go to the power options, and changed the Wireless Adapter Setting, from Maximum Power Setting to Maximum Performance.
Rick