Dont Pirate!neither do buy Vista and give Billygoat $$$ for a OS with DRM rootkit installed,get a Linux distro like Ubuntu or even better try the other free operating systems which are stable and superior UNIX ones like BSDs ,OpenSolaris etc.
Be Straight.use Linux,Open Source.
For Ubuntu(posted for viewers of thread):
http://ubuntu.com
AND
if u really want to buy a pc 100% working with superior OS,why not macintels
?