Rugrat
Consider downloading and using this free (trial) AVG Driver Updater (I use it and have the full subscription).
It'll scan the whole laptop and alert you of out of date drivers that may have been missed - as well as auto download and update them.
Very very much recommend you try this...
For a quick and easy test. Disconnect from your standard wifi, and use your phone as a Hotspot- connect your laptop to phone Hotspot and check the speed.
If all looks normal, it's almost certainly an issue between your wifi router and laptop - meaning a new router is in order.
That's my...