I know I am being a miserable troll, but some people may not realise how easy it is to try out Ubuntu Linux.
Its a
free download, and can be run off a CD or DVD without touching your hard disc drive, or it can installed as an application within windows (allowing easy removal if wanted).
Why bother? ITS FREE. (And Legal)
Also its quick, making a 3 year old computer seem like new again.
No virus problems.
No illegal licences required.
No microsoft tax.
Loads of great programs starting with Firefox and OpenOffice.
The only problem is that, like rabies, once bitten, you want to pass it on. (hence this post)