Internet download speed is much lower than upload one

[ingez2000]

My main PC is directly connected to router/modem. I am using AT&T Fiber Optic with 300 mbps speed. Recently download speed decreased to a crawl. I ran a speed test - download speed was 4 mbps while upload was 367 mbps (???). Reset the modem and ran antivirus scan. No change.
My other PC connected via WiFi shows higher download speed...

Any suggestions ?

 

[townsbg]

Try flushing your dns. Windows 7: DNS Flush - GROK Knowledge Base The article doesn't show this but I think that you need to right click on command prompt and select run as administrator. I would try an ipconfig /release nefore the flush and ipconfig /renew afterwards. Also check your duplex settings. Network Speed Windows 7 - University of Galway In my settings it just shows duplex.

 

[ingez2000]

Performed all the tasks you have suggested - no change...

 

[samuria]

Is this wireless or cable?

 

[townsbg]

Try this: How to Speed Up Your Internet Connection | Avast

 

[ingez2000]

This is cable connection

 

[samuria]

What is your network adapter is it 100 meg or a gig in properties what is it connecting at?