For the past two weeks my connection has been terrible. It gets really bad at around 7 pm to 11 pm and sometimes is bad all day. Anybody have any ideas? Thanks in advance. I have, we talked for an hour and the guy said that I probably had a virus on my computer, so he had me test my connection on another computer and the upload speed came out to be 2 Mbps and the guy said that it's fine. I'm supposed to be getting 5 Mbps  That's almost 5 times slower. Then he tried telling me that I'm lagging on my Xbox because we're watching Netflix at the same time, the thing is, I wasn't on both. Plus it never mattered before if I was doing both at the same time.

Might be your PC is infected with Virus or check the data cable, change the cable if you are connecting your PC through a Modem or Switch or Router. You should check the following as well whether the LAN port of your PC is working fine or not. Try inserting the other LAN card on the motherboard and Install the Latest Drivers, connect to the Internet check the speed. If every thing is right, problem is with the on board LAN card. Check the LAN drivers whether correctly installed or not. Go to motherboard manufacturer's site and download the Latest drivers.

Your PC might be infected with viruses or Trojans...etc or any ongoing downloads are going in background. check the applications or If any one around installed a speed limiter software's like Netlimiter, check the add/remove programmes in control and uninstall them. Fault with Internet browsers also is one of the reason, install a new browser don't install or update or uninstall the existing browsers.

If you are connecting through Router using WiFi, you need to check with router settings. Might be Router settings are reducing the speed of your Internet on Desktop.

There might be n number of reasons if there is no internet access.

Firstly check with the hardware you are using for your lan card and LAN card drivers should be updated prior to the vendor. If there are no correct or updated drivers the lan card is incompatible with the OS. It may not work properly.

Second thing make sure you know how to connect to internet by assigning IP address to connect into a LAN. If you are using a router or modem as per their configurations sometimes IP is assigned automatically by DHCP.

If you are using a modem, you need to create a dial up connection according to your internet service provider and a username and password required.

if you are connecting to a switch or router , make sure the lan cable(cat5 cable) is in good condition and use the climper to climp RJ45 clips.

If you are using broadband, some internet service providers may have login page.

If you have correct with all the above details your PC might have infected with virus or trojans etc. 

Before connecting to Internet make sure your PC is loaded with good antivirus system or internet security.