You are using windows, right?
Regardless of the operating system, there are several ways to tell what activities are happening. For example, if you have a virus or spyware, using windows, go start, run, cmd
in the command line that appears type netstat -a
You will get a list(possibly after a wait) of incoming and outgoing connections. For example, I can see amazon.com, cadvision.com and tribalfusion.com listed. I dont see why these need to be there, but I know they are advertisements. There are only about 20 items listed, and most are outgoing from my machine. Netbios and microsoft are a few, as well as some named for my user account.
What you are hoping to not see is a whole bunch, which could be indicative of malware flooding and denying your internet connection.
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davidred wrote...
I installed Ubuntu once and it completely destroyed my paying relationship with Microsoft.