If you are interested in free software and the whole coding portion of flash entertains or you just really dislike the Windows OS I would suggest testing out a distro of Linux. I have used Ubuntu (a distro of Linux) for a while and have become quite a fan and would switch over completely if it were not for the lack of Autodesk making CAD for it. Some great features of a linux based operating system are:
- High level of security (to date there have been no widespread viruses only proof of concepts)
- Easy to use with lots of free software (including equivalents of MsOffice, Photoshop, Illustrator, and more)
- High level of customization
- Stable (unless you install an unstable beta release)
Quick warning: you can do bad things if you are not careful while installing Linux so make sure to back up your files (though you should have done this anyways). Most of the more common installations allow you to install Linux as a second operating system so you can boot in both Windows (or Mac) and Linux but if you are not careful the installers can wipe your hard drive and leave you with only Linux (may not be so bad though to get rid of Windows).