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Sometimes my router shows huge Internet usage by my Windows laptop, but I am unaware of the reason.
I want to be sure that it's not infected with a virus. Is there software which can detect which EXE is using the Internet and how much data transfer it is doing?
If you use Windows Vista or later versions, you don't need to install any additional software to see the processes with network activity, Windows comes with Resource Monitor. You just need to have been the Windows task manager (Ctrl + Shift + Escape) and click on resource monitor:
In the "network" tab you can see the processes with network activity:
I believe that you can get this information from Process Explorer. It is a free download from Microsoft, (originally by Sysinternals), as it can let you see which process(es) are performing the most network traffic.
You could also take a look at Process Monitor. This story is well worth a read as well.
(Sorry can't include any screenshots at the moment as I am running Linux rather than Windows)
Take a look at Networx. It monitors IP traffic from your computer and will keep logs on a per process basis, it is also free.
Unlike most of the other suggestions, this utility logs usage over time, not just a real-time view of current usage.
If you use Windows XP or before, you can use Sygate Personal Firewall by http://en.wikipedia.org/wiki/Sygate_Technologies:
For the background story, Sygate Personal Firewall got bought and killed by Symantec (Norton), so was never made available for Windows 7 (still works great on XP though). And PC Tools Firewall had the same fate (bought and killed AGAIN by Symantec), only a bit later so I could run it on Windows 7, until it eventually broke (seems like it works with Windows 7 RTM but not with Windows 7 SP1).
