Are you running any firewall/antivirus software? Tried disabling them?
Also might be worth changing the DNS as well: https://developers.google.com/speed/public-dns/docs/using
Exactly how is the PC connected to the router?
No firewall/antivirus software, I'll have a look at changing DNS now. Its connected straight to the router
Here's my speed test but still I can only use internet freely when I have an online game running
