Microsoft have cracked down on retailers trying to sell alternate OS's when they sign a contract to sell Windoze. (This theoretically effecting people selling Amithlon pre-installed, or the likes). Essentially saying... :
(from slashdot.org) "Some Sys Admin sent in an email that he got from Dell which basically says Microsoft will no longer allow Dell to sell PCs without an operating system. " - But if you think this was only Dell, the wording seems to effect all retailers, read article for more information: http://slashdot.org/article.pl?sid=02/08/10/1420208.