If you are fed up with Microsoft then give this a chance, dual boot a copy on your hard drive and play.
Win7 has given me nothing but problems trying to set up my wireless network and punching through the firewall. AVG is used as the anti virus for win7, best product for keeping system speed.
The Linux systems don't need extra anti virus software and punching through the firewall is quite easy and keeps the system safe when connected to the Internet which is constant on my setup.
It would be a lie to say that Linux is easy to setup compared to win7, its not, but if once you have set the system up it stays set up and nothing seems to worry it.
For this price give it a try and share your findings...