Slow Internet on ONE computer

[Whoopsie988]

So I live in Australia and we currently have NBN. We generally get 20-25Mbps but I've been getting around 2-4 on my desktop. I've tested the internet on my iPod and it's fine. This has only happened within the last week. I have a D-Link DWA-131 Wireless N Nano Adapter plugged into USB 3.0. My YouTube videos were streaming perfectly at 720p but they rarely get to or above 360p now and have been sticking to 144p most of the time. My torrenting speed has also been much slower down from 2.1-3MBps to around 600KBps. 

 

I depend heavily on my computer and slow internet speeds interfere with that and just suck overall.

 

Any help would be greatly appreciated.

 

Edit 1: Now that I think about it this only started when my GPU died and I took it out, could this be from the iGPU not being activated?

Edit 2: I just checked Device Manager and Intel HD Graphics is activated and I updated the driver. The internet is just as slow.

[Simon771]

I bet someone in your house is messing with you and limited bandwitch to your PC lol

There is no other legit reason, why would you get slower speeds on one PC than another.

[LogicalDrm]

Are speeds as bad when you are using wired connection?

[andy432]

My suggestion is to enter safe mode with networking THEN test the speed, and if it's back to normal then something is using your network in the background, perhaps? Go back into normal mode and download a network monitoring program to see what exactly is using the network. Process Explorer should fit the bill, methinks. If nothing is using your network in the background, I would make sure your Wi-Fi adapter drivers are up to date or maybe a driver update caused the issue, in that case unplug the Wi-Fi adapter from the original usb port and move it to another, the default drivers will install again to let you check to see if the older drivers work better. This is probably a good time to mention that you should be putting the adapter into a usb 3.0 port.

[Sayrian]

Turn off all other devices connected to the network and see if that makes a difference. If not, uninstall and reinstall your USB WiFi adapter driver, sometimes that might help. And lastly, the most obvious, restart your router.