November 3 2011.
Your computer may have recently shown a firewall warning asking permission to run netsession_win.exe. Obviously something trustworthy that you installed yourself, right?
Fear not, it's just a utility from Akamai (a reputable company) installed without your consent or knowledge. If you don't want it on your computer you can uninstall it by first removing your tinfoil hat and then running the uninstall utility in:
Here's what their readme file has to say:
The Akamai NetSession Interface is a download manager application. It was
installed on your computer when you downloaded content that uses the service
to provide secure, high integrity downloads of large files.