Tired of annoying skype ads?
Is there a way to block them, modifying the hosts file of the computer.
The file is located in the C:\Windows\System32\drivers\etc\ folder, and simply add these lines after the other lines:

0.0.0.0 apps.skype.com
0.0.0.0 msads.net
0.0.0.0 ac3.msn.com
0.0.0.0 ad.doubleclick.net
0.0.0.0 ad-emea.doubleclick.net
0.0.0.0 adform.com
0.0.0.0 adform.net
0.0.0.0 ads1.msn.com
0.0.0.0 aka-cdn-ns.adtech.de
0.0.0.0 cdn.adnxs.com
0.0.0.0 cdn.atdmt.com
0.0.0.0 cdn.statics.live.spongecell.com
0.0.0.0 ds.serving-sys.com
0.0.0.0 ec.atdmt.com
0.0.0.0 g.msn.com
0.0.0.0 h2.msn.com
0.0.0.0 live.rads.msn.com
0.0.0.0 msntest.serving-sys.com
0.0.0.0 rad.msn.com
0.0.0.0 sO.2mdn.net
0.0.0.0 secure.flashtalking.com
0.0.0.0 secure.img-cdn.mediaplex.com
0.0.0.0 speed-s.pointroll.com
0.0.0.0 static.2mdn.net
0.0.0.0 track.adform.net
0.0.0.0 fd.rad.msn.com

After saving the file, open a command prompt and type the following command:

ipconfig /flushdns