slow connection
 
I would like to suggest you update the network card driver and run Windows Update to install all the important updates first.
 
If it does not work, I also would like to suggest you disable the automatic adjustment for the TCP window size on the network to check the issue.
 
1.   Click Start, click All Programs, and then click Accessories.
2.   Right-click Command Prompt, and then click Run as Administrator.
 
If you are prompted for an administrator password or for confirmation, type your password, or click Continue.
 
3.   At the command prompt, type the following command, and then press ENTER:
 
netsh interface tcp set global autotuninglevel=disabled
 
4.   Exit the Command Prompt window.
5.   Restart the computer.