All web browsers stop downloading data every few seconds

For the past few days, I've been having a problem with my internet connection.
When trying to access a website, my browser stops opening the site after a few seconds. Instead of going to a page reading "the connection has timed out," the page continues to load at a rate of .01 kb/s.
I've read that such problems can result from anti-virus programs, so after running scans with both McAfee and Malwarebytes, I disabled them both.
For about a minute, everything returned to normal, but then the problems started again.
I've also entered "netsh interface tcp set global autotuning=disabled" into command prompt, which had no effect.
There is one other Windows 7 computer on my network that it experiencing no problems. There is also a Mac and an XP on the network.

Unfortunately, the fix described in the other thread did not work.
The command in my original post is the only one I've used.

There were a few details I failed to mention in my original post:

I've tried using Chrome, Firefox, and IE, and all of them have the same problem. However, Steam (a program for purchasing and managing games) has a built in web browser. As far as I can tell, the Steam browser works fine.

After the problem started, I started a 60 MB text download. The download would run at normal speeds, but the download would freeze frequently, so I would have to pause and resume the download every few seconds.

Other than the test download, the only file I've downloaded recently is an update for McAfee, which was just a few hours before the problem began, which leads me to believe it is somehow related to McAfee.

Thanks for the help so far.

Thanks for your help.
Everything started working right away after running the McAfee removal tool.