Per
@popatim update your post to include full system hardware specs and OS information.
Include the wireless adapter: make, model, age, condition.
If possible try using a USB extension cable to move the USB wireless adapter up and away from the computer.
Before booting up feel the USB adapter. Get a sense of its' temperature. Then surf/browse etc. as normal: continue to carefully feel the USB adapter.
Does the adapter get warm, hot, or even very hot?
Also: run "ipconfig /all" (without quotes) via the Command Prompt.
Post the results.